diff --git a/Windows/zvuk_win.cpp b/Windows/zvuk_win.cpp
index ceacd50..2050cf3 100644
--- a/Windows/zvuk_win.cpp
+++ b/Windows/zvuk_win.cpp
@@ -1,5 +1,5 @@
 #include <skeldal_win.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 
 extern "C" 
   {
diff --git a/libs/zvuk.c b/ZVUK/zvuk.c
similarity index 100%
rename from libs/zvuk.c
rename to ZVUK/zvuk.c
diff --git a/libs/zvuk.h b/ZVUK/zvuk.h
similarity index 100%
rename from libs/zvuk.h
rename to ZVUK/zvuk.h
diff --git a/libs/zvuk_dx.cpp b/ZVUK/zvuk_dx.cpp
similarity index 100%
rename from libs/zvuk_dx.cpp
rename to ZVUK/zvuk_dx.cpp
diff --git a/libs/zvuka.asm b/ZVUK/zvuka.asm
similarity index 100%
rename from libs/zvuka.asm
rename to ZVUK/zvuka.asm
diff --git a/game/CMakeLists.txt b/game/CMakeLists.txt
index 2d613ea..8283f0b 100644
--- a/game/CMakeLists.txt
+++ b/game/CMakeLists.txt
@@ -42,4 +42,5 @@ target_link_libraries(skeldal
     skeldal_libs 
     skeldal_platform
     skeldal_sdl
+    skeldal_libs
      ${SDL2_LIBRARIES} pthread)
diff --git a/game/automap.c b/game/automap.c
index f892037..d14a325 100644
--- a/game/automap.c
+++ b/game/automap.c
@@ -11,7 +11,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include "engine1.h"
 #include <libs/pcx.h>
diff --git a/game/builder.c b/game/builder.c
index 2a484d3..e927bf0 100644
--- a/game/builder.c
+++ b/game/builder.c
@@ -11,7 +11,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include "engine1.h"
 #include <libs/pcx.h>
diff --git a/game/chargen.c b/game/chargen.c
index 757da6b..85f6050 100644
--- a/game/chargen.c
+++ b/game/chargen.c
@@ -12,7 +12,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/gui.h>
 #include <libs/basicobj.h>
 #include "engine1.h"
diff --git a/game/chargen2.c b/game/chargen2.c
index 069bd93..aab09e4 100644
--- a/game/chargen2.c
+++ b/game/chargen2.c
@@ -12,7 +12,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/gui.h>
 #include <libs/basicobj.h>
 #include "engine1.h"
diff --git a/game/dialogy.c b/game/dialogy.c
index 98a5792..6a698eb 100644
--- a/game/dialogy.c
+++ b/game/dialogy.c
@@ -12,7 +12,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include <libs/mgifmem.h>
 #include "engine1.h"
diff --git a/game/enemy.c b/game/enemy.c
index 597976f..02dbb7c 100644
--- a/game/enemy.c
+++ b/game/enemy.c
@@ -8,7 +8,7 @@
 #include <libs/event.h>
 #include <libs/memman.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include "engine1.h"
 #include "globals.h"
 #include "specproc.h"
diff --git a/game/engine1.c b/game/engine1.c
index 8ba1fd0..c59a670 100644
--- a/game/engine1.c
+++ b/game/engine1.c
@@ -7,7 +7,7 @@
 #include <libs/memman.h>
 #include <libs/bgraph.h>
 #include <libs/event.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include "math.h"
 #include "globals.h"
 #include "engine1.h"
diff --git a/game/gamesave.c b/game/gamesave.c
index f8cab09..fb28d59 100644
--- a/game/gamesave.c
+++ b/game/gamesave.c
@@ -14,7 +14,7 @@
 #include <libs/bmouse.h>
 #include <libs/memman.h>
 #include <fcntl.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <stdarg.h>
 #include "globals.h"
 #include "temp_storage.h"
diff --git a/game/globals.h b/game/globals.h
index c655cd3..43489ea 100644
--- a/game/globals.h
+++ b/game/globals.h
@@ -1428,12 +1428,12 @@ extern char **sound_table;
 
 void init_tracks(void);
 void recalc_volumes(int sector,int side);
-void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p);
+void play_effekt(int x,int y,int xd,int yd,int sector, int side,const TMA_SOUND *p);
 void create_playlist(char *playlist);
 const char *get_next_music_from_playlist(void);
 const char * end_of_song_callback(void *ctx);
 void purge_playlist(void);
-void play_sample_at_sector(int sample,int sector1,int sector2,int track, char loop);
+void play_sample_at_sector(int sample,int listener,int source,int track, char loop);
 void play_sample_at_channel(int sample,int channel,int vol);
 void stop_track(int track);
 char test_playing(int track);
diff --git a/game/globmap.c b/game/globmap.c
index 23a283d..67d79e5 100644
--- a/game/globmap.c
+++ b/game/globmap.c
@@ -12,7 +12,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include "engine1.h"
 #include <libs/pcx.h>
diff --git a/game/interfac.c b/game/interfac.c
index 60351ea..75370e4 100644
--- a/game/interfac.c
+++ b/game/interfac.c
@@ -13,7 +13,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/memman.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include <ctype.h>
 #include <libs/gui.h>
diff --git a/game/inv.c b/game/inv.c
index 73e59ee..8f62bdd 100644
--- a/game/inv.c
+++ b/game/inv.c
@@ -11,7 +11,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/gui.h>
 #include <libs/basicobj.h>
 #include "engine1.h"
diff --git a/game/macros.c b/game/macros.c
index 84e7e7a..93de2a0 100644
--- a/game/macros.c
+++ b/game/macros.c
@@ -11,7 +11,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include "engine1.h"
 #include <libs/pcx.h>
@@ -185,7 +185,7 @@ void macro_sound(const TMA_SOUND *p,int psect,int pdir,int sect,int dir)
   if (sound_side_flags & SD_PRIM_FORV) up=2;
   if (~(p->bit16) & up) {
      if (psect) {
-       play_effekt(map_coord[sect].x,map_coord[sect].y,map_coord[psect].x,map_coord[psect].y,dir,pdir,p);
+       play_effekt(map_coord[sect].x,map_coord[sect].y,map_coord[psect].x,map_coord[psect].y,psect,pdir,p);
      }      else {
        play_effekt(0,0,0,0,-1,-1,p);
      }
diff --git a/game/menu.c b/game/menu.c
index 9515e38..7ecfdb6 100644
--- a/game/menu.c
+++ b/game/menu.c
@@ -11,7 +11,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include <stdarg.h>
 #include "engine1.h"
diff --git a/game/realgame.c b/game/realgame.c
index c00ee72..e38d11c 100644
--- a/game/realgame.c
+++ b/game/realgame.c
@@ -11,7 +11,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include "engine1.h"
 #include <libs/pcx.h>
@@ -185,7 +185,6 @@ int load_map(char *filename)
   mob_template=NULL;
   mob_size=0;
   if (f==NULL) return -1;
-  if (snd_devnum==DEV_DAC) stop_mixing();
   do
      {
      r=load_section(f,&temp,&sect,&size);
@@ -329,7 +328,6 @@ int load_map(char *filename)
      exit(0);
      }
   doNotLoadMapState=0;
-  if (snd_devnum==DEV_DAC) start_mixing();
   return suc;
   }
 
@@ -1605,45 +1603,49 @@ void step_zoom(char smer)
   if (cur_mode==MD_GAME) recalc_volumes(viewsector,viewdir);
   }
 
-void turn_zoom(int smer)
-  {
-  if (running_anm) return;
-  if (pass_zavora) return;else pass_zavora=1;
-  if (!GlobEvent(MAGLOB_ONTURN,viewsector,viewdir)) return;
-  if (set_halucination) do_halucinace();
-  norefresh=1;
-  hold_timer(TM_BACK_MUSIC,1);
-                 viewdir=(viewdir+smer)&3;
-                 render_scene(viewsector,viewdir);
-                 hide_ms_at(387);
-                 OutBuffer2nd();
-                 other_draw();
-                 bott_draw(0);
-                 if (smer==1)
-                    {
-                    anim_sipky(H_SIPKY_SV,1);
-                    anim_sipky(0,255);
-                    turn_left();
-                    }
-                    else
-                    {
-                    anim_sipky(H_SIPKY_SZ,1);
-                    anim_sipky(0,255);
-                    turn_right();
-                    }
-  chod_s_postavama(0);
-  if (battle || (game_extras & EX_ALWAYS_MINIMAP)) draw_medium_map();
-  update_mysky();
-  ukaz_mysku();
-  showview(0,0,0,0);
-  recalc_volumes(viewsector,viewdir);
-  if (!battle) calc_game();
-  norefresh=0;
-  cancel_render=1;
-  hold_timer(TM_BACK_MUSIC,0);
-  mix_back_sound(0);
-  pass_zavora=0;
-  }
+void turn_zoom(int smer) {
+    if (running_anm)
+        return;
+    if (pass_zavora)
+        return;
+    else
+        pass_zavora = 1;
+    if (!GlobEvent(MAGLOB_ONTURN, viewsector, viewdir))
+        return;
+    if (set_halucination)
+        do_halucinace();
+    norefresh = 1;
+    hold_timer(TM_BACK_MUSIC, 1);
+    viewdir = (viewdir + smer) & 3;
+    recalc_volumes(viewsector, viewdir);
+    render_scene(viewsector, viewdir);
+    hide_ms_at(387);
+    OutBuffer2nd();
+    other_draw();
+    bott_draw(0);
+    if (smer == 1) {
+        anim_sipky(H_SIPKY_SV, 1);
+        anim_sipky(0, 255);
+        turn_left();
+    } else {
+        anim_sipky(H_SIPKY_SZ, 1);
+        anim_sipky(0, 255);
+        turn_right();
+    }
+    chod_s_postavama(0);
+    if (battle || (game_extras & EX_ALWAYS_MINIMAP))
+        draw_medium_map();
+    update_mysky();
+    ukaz_mysku();
+    showview(0, 0, 0, 0);
+    if (!battle)
+        calc_game();
+    norefresh = 0;
+    cancel_render = 1;
+    hold_timer(TM_BACK_MUSIC, 0);
+    mix_back_sound(0);
+    pass_zavora = 0;
+}
 
 int check_path(word **path,word tosect)
   {
diff --git a/game/setup.c b/game/setup.c
index 5a6658e..cc99a40 100644
--- a/game/setup.c
+++ b/game/setup.c
@@ -10,7 +10,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/bgraph.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include "engine1.h"
 #include <libs/pcx.h>
diff --git a/game/skeldal.c b/game/skeldal.c
index cb6d3d4..967b70b 100644
--- a/game/skeldal.c
+++ b/game/skeldal.c
@@ -8,7 +8,7 @@
 #include <libs/event.h>
 #include <libs/bmouse.h>
 #include <libs/memman.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include <libs/gui.h>
 #include <libs/basicobj.h>
@@ -87,8 +87,6 @@ THUMAN postavy[POCET_POSTAV],postavy_save[POCET_POSTAV];
 void (*unwire_proc)(void);
 void (*wire_proc)(void);
 char cur_mode,battle_mode;
-static int init_music_vol=127;
-static int init_gfx_vol=255;
 static char titles_on=0;
 
 const void *pcx_fade_decomp(const void *p, int32_t *s);
@@ -498,25 +496,6 @@ void set_font(int font,int c1,...)
   memcpy(f_default,charcolors,sizeof(charcolors));
   }
 
-void music_init(void)
-  {
-//  char *path;
-/*  if (sound_detection)
-     {
-
-     if (sound_detect(&snd_devnum,&snd_parm1,&snd_parm2,&snd_parm3)) snd_devnum=DEV_NOSOUND;
-     }*/
-  SEND_LOG("(SOUND) SOUND_SET Setting Sound: Device '%s' Port: %3X",device_name(snd_devnum),snd_parm1);
-  SEND_LOG("(SOUND) SOUND_SET Setting Sound: IRQ: %X DMA: %X",snd_parm2,snd_parm3);
-  set_mixing_device(snd_devnum,snd_mixing,snd_parm1,snd_parm2,snd_parm3);
-
-  start_mixing();
-  set_snd_effect(SND_GFX,init_gfx_vol);
-  set_snd_effect(SND_MUSIC,init_music_vol);
-//  path=plugins_path;
-
-
-  }
 
 void clrscr(void)
   {
@@ -984,7 +963,8 @@ void init_skeldal(const INI_CONFIG *cfg)
 
   add_game_window();
 
-  music_init();
+  game_sound_init_device(ini_section_open(cfg, "audio"));
+  start_mixing();
 
   if ((verr=init_mysky())!=0)
      {
@@ -1267,7 +1247,7 @@ void play_anim(int anim_num)
      TSTR_LIST titl=NULL;
      const char *s = build_pathname(2,gpathtable[SR_VIDEO], texty[anim_num]);
      s = local_strdup(s);
-     if (snd_devnum==DEV_NOSOUND || titles_on)
+     if (titles_on)
       {
       concat(t,s,"   ");
       z=strrchr(t,'.');
@@ -1344,8 +1324,8 @@ static void game_big_circle(char enforced)
          {viewdir=i;break;}
       }
      }
-    for(r=0;r<mapsize*4;r++) call_macro(r,MC_STARTLEV);
     recalc_volumes(viewsector,viewdir);
+    for(r=0;r<mapsize*4;r++) call_macro(r,MC_STARTLEV);
     loadlevel.name[0]=0;
     reroll_all_shops();
 
diff --git a/game/sndandmus.c b/game/sndandmus.c
index a15e29b..fa6046e 100644
--- a/game/sndandmus.c
+++ b/game/sndandmus.c
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 
 #include <libs/memman.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/wav_mem.h>
 #include <libs/event.h>
 #include "globals.h"
@@ -29,13 +29,27 @@ typedef struct snd_info
   {
   const TMA_SOUND *data;              //4
   short xpos,ypos,side;         //10
-  word volume,block;            //14
+  word volume,sample_block;            //14
+  word sector;
   }SND_INFO;
 
 static short chan_state[CHANNELS];
 static short track_state[TRACKS];
 short sample_volume=255;
 
+typedef struct sound_side_map_dir_t {
+    uint32_t distance;
+    int32_t visit_counter;
+} TSOUND_SIDE_MAP_DIR;
+
+typedef struct sound_side_map_t {
+    TSOUND_SIDE_MAP_DIR parts[4];
+} TSOUND_SIDE_MAP;
+
+static TSOUND_SIDE_MAP *current_sound_sector_map = NULL;
+static size_t current_sound_sector_map_size = 0;
+static int32_t current_sound_sector_map_counter = 0;
+
 //static struct t_wave wav_last_head;
 //static int wav_last_size;
 static int mute_task=-1;
@@ -140,7 +154,7 @@ void release_channel(int channel)
   if (i==-1) return;
   mute_channel(channel);
      {
-     aunlock(playings[channel].block);
+     aunlock(playings[channel].sample_block);
      chan_state[channel]=-1;
      track_state[i]=-1;
      }
@@ -158,7 +172,62 @@ int calc_volume(int *x,int *y,int side)
   return ds;
   }
 
-int calcul_volume(int chan,int x,int y,int side,int volume)
+int set_channel_volume_from_sector(int channel,
+                                    int sound_source_sector,
+                                    int sound_source_side,
+                                   int listener_sector,
+                                   int listener_direction,
+                                   int volume) {
+    const int maxvolume = 32768;
+    volume = 255*volume/100;
+    int left = maxvolume;
+    int right = maxvolume;
+    if (sound_source_sector > mapsize) return 0;
+    if (sound_source_sector <0 || sound_source_sector == listener_sector) {
+        if (sound_source_side >= 0) {
+            int ddf = (sound_source_side + 4 - listener_direction) & 3;
+            switch (ddf) {
+                default:
+                case 0:
+                case 2: left = right = maxvolume;break;
+                case 1: left = maxvolume/4; right = maxvolume;break;
+                case 3: left = maxvolume; right = maxvolume/4;break;
+            }
+        }
+    } else {
+
+        const TSOUND_SIDE_MAP *p = current_sound_sector_map+sound_source_sector;
+        left = 0;
+        right = 0;
+        for (int i = 0; i < 4; ++i) {
+            if (p->parts[i].visit_counter == current_sound_sector_map_counter) {
+                int dist = p->parts[i].distance;
+                if (!dist) return 1; //error
+                int inc = maxvolume/(dist*dist);
+                switch(i) {
+                    default:
+                    case 2:
+                    case 0: left += inc; right += inc; break;
+                    case 1: right += inc;break;
+                    case 3: left += inc;break;
+
+                }
+            }
+        }
+
+    }
+    left = (left * volume) >> 8;
+    right = (right * volume) >> 8;
+    if (left > maxvolume) left = maxvolume;
+    if (right > maxvolume) right = maxvolume;
+    if (left == 0  && right == 0) return 0;
+
+    set_channel_volume(channel,left,right);
+    return 1;
+
+}
+
+/*int calcul_volume(int chan,int x,int y,int side,int volume)
   {
   int lv,rv;
   int ds,bal,i;
@@ -195,7 +264,7 @@ int calcul_volume(int chan,int x,int y,int side,int volume)
   set_channel_volume(chan,lv,rv);
   return 0;
   }
-
+*/
 const void *wav_load(const void *p, int32_t *s)
   {
   const char *sr;
@@ -220,7 +289,7 @@ const void *wav_load(const void *p, int32_t *s)
   return tgr;
   }
 
-void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p)
+void play_effekt(int x,int y,int xd,int yd,int sector,int side,const TMA_SOUND *p)
   {
   int chan;
   int blockid;
@@ -228,14 +297,14 @@ void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p
   const char *s;
 
   if (!sound_enabled) return;
-  side;
   chan=find_free_channel(p->soundid);
   release_channel(chan);
   track=&tracks[p->soundid];
   track->data=p;
   track->xpos=xd;
   track->ypos=yd;
-  track->side=sided;
+  track->side=side;
+  track->sector = sector;
   track_state[p->soundid]=-1;
   if (p->bit16 & 0x8)
      {
@@ -244,7 +313,8 @@ void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p
      else set_channel_volume(chan,vol,rnd(vol));
      }
   else {
-     if (calcul_volume(chan,x-xd,y-yd,/*side-*/sided,p->volume)) return;
+      if (!set_channel_volume_from_sector(chan, sector, side, viewsector, viewdir, p->volume))
+          return;
   }
 
     blockid = find_handle(p->filename, wav_load);
@@ -260,12 +330,75 @@ void play_effekt(int x,int y,int xd,int yd,int side,int sided,const TMA_SOUND *p
       playings[chan].data=p;
       playings[chan].xpos=xd;
       playings[chan].ypos=yd;
-      playings[chan].side=sided;
+      playings[chan].sector = sector;
+      playings[chan].side=side;
       playings[chan].volume=p->volume;
-      playings[chan].block=blockid;
+      playings[chan].sample_block=blockid;
       chan_state[chan]=p->soundid;
       track_state[p->soundid]=chan;
   }
+
+typedef struct _sound_map_queue_t {
+    int from_sector;
+    int to_sector;
+} TSOUND_MAP_QUEUE;
+
+static void build_dungeon_sound_map_in_dir(int sector, int side, int position, int32_t counter) {
+    if (map_sectors[sector].step_next[side] == 0
+               || !(map_sides[sector * 4 +side].flags & SD_TRANSPARENT)) return;
+
+    TSOUND_MAP_QUEUE queue[128];
+    int qbeg = 0;
+    int qend = 0;
+    queue[qend].from_sector = sector;
+    queue[qend].to_sector = map_sectors[sector].step_next[side];
+    ++qend;
+    while (qbeg != qend) {
+        const TSOUND_MAP_QUEUE *item = queue+(qbeg % countof(queue));
+        int cursect = item->to_sector;
+        int fromsect = item->from_sector;
+        ++qbeg;
+        if (current_sound_sector_map[cursect].parts[position].visit_counter != counter) {
+            current_sound_sector_map[cursect].parts[position].visit_counter = counter;
+            int d = current_sound_sector_map[cursect].parts[position].distance =
+                    current_sound_sector_map[fromsect].parts[position].distance + 1;
+            if (d<32) {
+                for (int i = 0; i < 4; ++i) {
+                    int nx = map_sectors[cursect].step_next[i];
+                    if (nx && (map_sides[cursect * 4 +i].flags & SD_TRANSPARENT)) {
+                        if (current_sound_sector_map[nx].parts[position].visit_counter != counter) {
+                            TSOUND_MAP_QUEUE *t = queue+(qend % countof(queue));
+                            ++qend;
+                            t->from_sector = cursect;
+                            t->to_sector = nx;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+}
+
+static void build_dungeon_sound_map(int sector, int side) {
+    if (mapsize != (int)current_sound_sector_map_size) {
+        free(current_sound_sector_map);
+        current_sound_sector_map = NewArr(TSOUND_SIDE_MAP, mapsize);
+        current_sound_sector_map_size = mapsize;
+    }
+    int32_t counter = ++current_sound_sector_map_counter;
+    if (sector > mapsize) return;
+    for (int i = 0; i < 4; ++i) {
+        current_sound_sector_map[sector].parts[i].distance = 0;
+        current_sound_sector_map[sector].parts[i].visit_counter = counter;
+    }
+    build_dungeon_sound_map_in_dir(sector, side, 0, counter);
+    build_dungeon_sound_map_in_dir(sector, (side+1)&3, 1, counter);
+    build_dungeon_sound_map_in_dir(sector, (side+2)&3, 2, counter);
+    build_dungeon_sound_map_in_dir(sector, (side+3)&3, 3, counter);
+}
+
+
 void recalc_volumes(int sector,int side)
   {
   int i;
@@ -275,16 +408,29 @@ void recalc_volumes(int sector,int side)
 
   side;
   SEND_LOG("(SOUND) %s","Recalculating volumes");
+  build_dungeon_sound_map(sector, side);
   newx=map_coord[sector].x;
   newy=map_coord[sector].y;
 //  layer=map_coord[sector].layer;
-  for(i=0;i<CHANNELS;i++)
+  for(i=0;i<CHANNELS;i++) {
+      int volume = playings[i].volume;
      if (chan_state[i]>=0 && playings[i].side>=0)
         {
-        calcul_volume(i,newx-playings[i].xpos,newy-playings[i].ypos,/*side-*/playings[i].side,playings[i].volume);
+         set_channel_volume_from_sector(
+                 i,
+                 playings[i].sector,
+                 playings[i].side,
+                 sector,
+                 side,
+                 volume);
+        //calcul_volume(i,newx-playings[i].xpos,newy-playings[i].ypos,/*side-*/playings[i].side,playings[i].volume);
         if (!get_channel_state(i)) release_channel(i);
         }
-     else calcul_volume(i,0,0,-1,playings[i].volume);
+     else {
+         int v = SND_EFF_MAXVOL*volume / 100;
+         set_channel_volume(i, v, v);
+     }
+  }
   for(i=1;i<TRACKS;i++) if (track_state[i]<0 && tracks[i].data!=NULL)
      {
      if (tracks[i].side<0)
@@ -296,7 +442,8 @@ void recalc_volumes(int sector,int side)
         {
        int x=newx-tracks[i].xpos, y=newy-tracks[i].ypos;
         if (calc_volume(&x,&y,tracks[i].side)>0)
-           if (have_loop(tracks[i].data))play_effekt(newx,newy,tracks[i].xpos,tracks[i].ypos,side,tracks[i].side,tracks[i].data);
+           if (have_loop(tracks[i].data))
+               play_effekt(newx,newy,tracks[i].xpos,tracks[i].ypos,tracks[i].sector,tracks[i].side,tracks[i].data);
         }
      }
   mute_task=-1;
@@ -360,7 +507,7 @@ const char *get_next_music_from_playlist()
   if (!remain_play)
      for(i=0;cur_playlist[i]!=NULL;remain_play++,i++) cur_playlist[i][0]=32;
   if (play_list_mode==PL_RANDOM)
-     step=rand()*(playlist_size-1)/32768+1;
+     step=rnd(playlist_size)+1;
   else
      step=1;
   i=playing_track;
@@ -387,24 +534,22 @@ void purge_playlist()
   cur_playlist=NULL;
   }
 
-void play_sample_at_sector(int sample,int sector1,int sector2,int track, char loop)
+void play_sample_at_sector(int sample,int listener,int source,int track, char loop)
   {
-  int x,y,xd,yd,chan;
+  int xd,yd,chan;
   const char *s;
   struct t_wave *p;
   int siz;
 	int oldtrack;
 
   if (!sound_enabled) return;
-  if (map_coord[sector1].layer!=map_coord[sector2].layer) return;
-  x=map_coord[sector1].x;
-  y=map_coord[sector1].y;
-  xd=map_coord[sector2].x;
-  yd=map_coord[sector2].y;
+  if (map_coord[listener].layer!=map_coord[source].layer) return;
+  xd=map_coord[source].x;
+  yd=map_coord[source].y;
   chan=find_free_channel(track);
 	oldtrack=track_state[track];
   if (!track || oldtrack==-1) release_channel(chan);
-  if (calcul_volume(chan,x-xd,y-yd,viewdir,100)) return;
+  if (!set_channel_volume_from_sector(chan, source, -1, listener, -1, 100)) return;
   if (!track || oldtrack==-1)
      {
      alock(sample);
@@ -419,7 +564,8 @@ void play_sample_at_sector(int sample,int sector1,int sector2,int track, char lo
   playings[chan].ypos=yd;
   playings[chan].side=viewdir;
   playings[chan].volume=100;
-  playings[chan].block=sample;
+  playings[chan].sample_block=sample;
+  playings[chan].sector=source;
   chan_state[chan]=track;
   track_state[track]=chan;
   }
@@ -519,7 +665,8 @@ char test_playing(int track)
   return track_state[track]!=-1;
   }
 
-static int flute_canal=30;
+static int flute_channel=30;
+static int flute_channel_offset = 0;
 
 void start_play_flute(char note)
   {
@@ -534,8 +681,9 @@ void start_play_flute(char note)
      q=ablock(H_FLETNA);
      w=q;w+=sizeof(struct t_wave)+4;
      vol*=SND_EFF_MAXVOL/100;
-     set_channel_volume(flute_canal,vol,vol);
-     play_sample(flute_canal,w,0x1665,0xADE,(int)(realfrq+0.5),1);
+     int ch = flute_channel+flute_channel_offset;
+     set_channel_volume(ch,vol,vol);
+     play_sample(ch,w,0x1665,0xADE,(int)(realfrq+0.5),1);
      }
   else
      {
@@ -552,8 +700,9 @@ void stop_play_flute()
      {
      q=ablock(H_FLETNA);
      w=q;w+=sizeof(struct t_wave);
-     chan_break_ext(flute_canal,w+4,*(int *)w);
-     flute_canal^=1;
+     int ch = flute_channel+flute_channel_offset;
+     chan_break_ext(ch,w+4,*(int *)w);
+     flute_channel_offset = (flute_channel_offset+1) & 7;
      }
   else
      {
diff --git a/game/souboje.c b/game/souboje.c
index bf31f3a..e7936bc 100644
--- a/game/souboje.c
+++ b/game/souboje.c
@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <libs/event.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/bgraph.h>
 #include <libs/bmouse.h>
 
diff --git a/game/wizard.c b/game/wizard.c
index b126279..a2ba00c 100644
--- a/game/wizard.c
+++ b/game/wizard.c
@@ -12,7 +12,7 @@
 #include <libs/devices.h>
 #include <libs/bmouse.h>
 #include <libs/memman.h>
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 #include <libs/strlite.h>
 #include <libs/gui.h>
 #include <libs/basicobj.h>
diff --git a/libs/CMakeLists.txt b/libs/CMakeLists.txt
index e939471..903e7af 100644
--- a/libs/CMakeLists.txt
+++ b/libs/CMakeLists.txt
@@ -13,7 +13,8 @@ SET(files basicobj.c
           pcx.c
           strlite.c
           wav_mem.c
-          strlists.c          
+          strlists.c
+          music.cpp          
           swaper.c )
 
 add_library(skeldal_libs  ${files})
diff --git a/libs/mgfplay.c b/libs/mgfplay.c
index e8d6107..81b66ea 100644
--- a/libs/mgfplay.c
+++ b/libs/mgfplay.c
@@ -69,7 +69,7 @@
 #include <libs/bgraph.h>
 #include <libs/memman.h>
 
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 
 //#include <vesa.h>
 //#include <i86.h>
diff --git a/libs/mgifmapmem.c b/libs/mgifmapmem.c
index bba6080..fdc67ca 100644
--- a/libs/mgifmapmem.c
+++ b/libs/mgifmapmem.c
@@ -5,7 +5,7 @@
 #include "memman.h"
 #include "mem.h"
 #include "mgifmem.h"
-#include <libs/zvuk.h>
+#include <platform/sound.h>
 
 static MGIF_HEADER_T *mgif_header;
 
diff --git a/libs/music.cpp b/libs/music.cpp
new file mode 100644
index 0000000..dc6024d
--- /dev/null
+++ b/libs/music.cpp
@@ -0,0 +1,161 @@
+#include "music.h"
+#include <platform/platform.h>
+
+#include <atomic>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <string_view>
+#include <vector>
+#include <utility>
+
+
+
+class MUSStreamParser: public IMusicStream {
+public:
+
+    MUSStreamParser(const char *name) {
+        data = map_file_to_memory(file_icase_find(name), &sz);
+        if (data) {
+            _loaded = true;
+            iter = reinterpret_cast<const uint8_t *>(data);
+            chans = read_short();
+            freq = read_int();
+            iter += 4;
+            blocks = read_int();
+            iter += 8;
+            std::memcpy(btable,iter,sizeof(btable));
+            iter += sizeof(btable);
+            btable[0] = -31767;
+        }
+    }
+
+    ~MUSStreamParser() {
+        if (data) unmap_file(data, sz);
+    }
+    MUSStreamParser(const MUSStreamParser &) = delete;
+    MUSStreamParser& operator=(const MUSStreamParser &) = delete;
+
+    bool is_loaded() const {return _loaded;}
+
+
+    virtual TMUSIC_STREAM_INFO get_info() const override {
+        TMUSIC_STREAM_INFO r;
+        r.format = 2;
+        r.channels = chans;
+        r.freq = freq;
+        return r;
+    }
+
+    virtual std::string_view read() override {
+        if (unprocessed_buffer.empty()) {
+            if (!process_next()) return {};
+        }
+        return std::exchange(unprocessed_buffer, {});
+    }
+    virtual void put_back(std::string_view data) override {
+        unprocessed_buffer = data;
+    }
+
+protected:
+    bool _loaded = false;
+    void *data;
+    std::size_t sz;
+
+    std::int16_t chans;
+    std::int32_t freq;
+    std::int32_t blocks;
+    short btable[256];
+    const uint8_t *iter;
+    std::vector<int16_t> outbuff;
+    std::string_view unprocessed_buffer;
+
+    int32_t read_int() {
+        int32_t r = iter[0] | (iter[1] << 8) | (iter[2]<<16) | (iter[3] << 24);
+        iter+=4;
+        return r;
+    }
+    int16_t read_short() {
+        int16_t r = iter[0] | (iter[1] << 8);
+        iter+=2;
+        return r;
+    }
+
+    bool process_next() {
+        if (blocks == 0) {
+            return false;
+        }
+        --blocks;
+        std::int32_t p = read_int();
+        read_int();
+        outbuff.clear();
+
+        short accum[2]={0,0};
+        int c = 0;
+        for (int i = 0; i < p; ++i) {
+            uint8_t p = *iter++;
+            short val=accum[c]+btable[p];
+            accum[c]=val;
+            /*
+            if (p==0)  //pridano jako provizorni reseni pro korekci chyby komprimacniho programu
+                  {
+                  val-=31767;
+                  }
+             */
+             c = (c + 1) % chans;
+             outbuff.push_back(val);
+        }
+        unprocessed_buffer = {reinterpret_cast<const char *>(outbuff.data()), outbuff.size()*2};
+        return true;
+    }
+
+
+};
+
+
+void music_close(TMUSIC_STREAM *stream) {
+    if (stream) {
+        IMusicStream *s = static_cast<IMusicStream *>(stream);
+        delete s;
+    }
+}
+
+TMUSIC_STREAM *music_open(const char *filename) {
+    MUSStreamParser *player =  new MUSStreamParser(filename);
+    if (player->is_loaded()) return player;
+    delete player;
+    return NULL;
+}
+
+TMUSIC_STREAM_CHUNK music_read(TMUSIC_STREAM *stream) {
+    TMUSIC_STREAM_CHUNK r = {NULL,0};
+    if (stream) {
+        IMusicStream *s = static_cast<IMusicStream *>(stream);
+        auto data = s->read();
+        r.ptr = data.data();
+        r.sz = data.size();
+    }
+    return r;
+}
+
+char music_is_eof(const TMUSIC_STREAM_CHUNK *chunk) {
+    return chunk->sz == 0;
+}
+
+void music_put_back_chunk(TMUSIC_STREAM *stream, const TMUSIC_STREAM_CHUNK *chunk){
+    if (stream) {
+        IMusicStream *s = static_cast<IMusicStream *>(stream);
+        s->put_back({reinterpret_cast<const char *>(chunk->ptr), chunk->sz});
+    }
+}
+
+TMUSIC_STREAM_INFO music_get_info(const TMUSIC_STREAM *stream) {
+    if (stream) {
+        const IMusicStream *s = static_cast<const IMusicStream *>(stream);
+        return s->get_info();
+    } else {
+        TMUSIC_STREAM_INFO r = {};
+        return r;
+    }
+}
+
diff --git a/libs/music.h b/libs/music.h
new file mode 100644
index 0000000..56f62de
--- /dev/null
+++ b/libs/music.h
@@ -0,0 +1,51 @@
+#pragma once
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct music_stream_t {} TMUSIC_STREAM;
+
+typedef struct music_stream_info_t {
+    int freq;
+    int channels;
+    int format; //1 - uint8_t. 2 - int16_t
+} TMUSIC_STREAM_INFO;
+
+
+typedef struct music_stream_chunk_t {
+    const void *ptr;
+    size_t sz;
+} TMUSIC_STREAM_CHUNK;
+
+
+
+///open music stream
+TMUSIC_STREAM *music_open(const char *filename);
+///retrieve information
+TMUSIC_STREAM_INFO music_get_info(const TMUSIC_STREAM *stream);
+
+TMUSIC_STREAM_CHUNK music_read(TMUSIC_STREAM *stream);
+
+char music_is_eof(const TMUSIC_STREAM_CHUNK *chunk);
+
+void music_put_back_chunk(TMUSIC_STREAM *stream, const TMUSIC_STREAM_CHUNK *chunk);
+
+///close music stream
+void music_close(TMUSIC_STREAM *stream);
+
+
+#ifdef __cplusplus
+}
+
+#include <string_view>
+class IMusicStream: public TMUSIC_STREAM {
+public:
+    virtual ~IMusicStream() = default;
+    virtual TMUSIC_STREAM_INFO get_info() const = 0;
+    virtual std::string_view read() = 0;
+    virtual void put_back(std::string_view data) = 0;
+};
+
+#endif
diff --git a/platform/platform.h b/platform/platform.h
index c3f1975..96aa404 100644
--- a/platform/platform.h
+++ b/platform/platform.h
@@ -75,6 +75,7 @@ int stricmp(const char *a, const char *b);
 void strupr(char *c);
 const char * int2ascii(int i, char *c, int radix);
 
+int get_timer_value(void);
 uint32_t get_game_tick_count(void);
 void sleep_ms(uint32_t);
 
diff --git a/platform/sdl/BGraph2.cpp b/platform/sdl/BGraph2.cpp
index db43325..3d101ab 100644
--- a/platform/sdl/BGraph2.cpp
+++ b/platform/sdl/BGraph2.cpp
@@ -12,7 +12,7 @@ static uint16_t screen_pitch = 640;
 
 char game_display_init(const INI_CONFIG_SECTION *display_section, const char *title) {
 
-    SDLContext::Config cfg  = {};
+    SDLContext::VideoConfig cfg  = {};
     const char *aspect_str;
 
     aspect_str = ini_get_string(display_section, "aspect_ratio", "4:3");
diff --git a/platform/sdl/CMakeLists.txt b/platform/sdl/CMakeLists.txt
index 82b28fd..da07b3a 100644
--- a/platform/sdl/CMakeLists.txt
+++ b/platform/sdl/CMakeLists.txt
@@ -1,4 +1,8 @@
 add_subdirectory(tests)
 
-add_library(skeldal_sdl sdl_context.cpp BGraph2.cpp input.cpp sound.cpp)
+add_library(skeldal_sdl 
+            sdl_context.cpp 
+            BGraph2.cpp 
+            input.cpp 
+            sound.cpp)
 set_property(TARGET skeldal_sdl PROPERTY CXX_STANDARD 20)
diff --git a/platform/sdl/sdl_context.cpp b/platform/sdl/sdl_context.cpp
index 196b76e..0888089 100644
--- a/platform/sdl/sdl_context.cpp
+++ b/platform/sdl/sdl_context.cpp
@@ -24,6 +24,11 @@ void SDLContext::SDL_Deleter::operator ()(SDL_Texture* texture) {
     SDL_DestroyTexture(texture);
 }
 
+void SDLContext::SDL_Audio_Deleter::operator()(void *x) {
+    SDL_AudioDeviceID id = reinterpret_cast<std::uintptr_t>(x);
+    SDL_CloseAudioDevice(id);
+}
+
 struct SDL_INIT_Context {
 
     SDL_INIT_Context() {
@@ -80,7 +85,7 @@ void SDLContext::generateCRTTexture(SDL_Renderer* renderer, SDL_Texture** textur
 
 
 
-void SDLContext::init_video(const Config &config, const char *title) {
+void SDLContext::init_video(const VideoConfig &config, const char *title) {
     char buff[256];
     static Uint32 update_request_event = SDL_RegisterEvents(1);
     _update_request_event = update_request_event;
@@ -502,3 +507,32 @@ SDL_Rect SDLContext::to_window_rect(const SDL_Rect &winrc, const SDL_Rect &sourc
 void SDLContext::set_quit_callback(std::function<void()> fn) {
     _quit_callback = std::move(fn);
 }
+
+SDLContext::AudioInfo SDLContext::init_audio(const AudioConfig &config, SDL_AudioCallback cb, void *cb_ctx) {
+    char buff[256];
+    _audio.reset();
+    SDL_AudioSpec aspec = {};
+    aspec.callback = cb;
+    aspec.userdata = cb_ctx;
+    aspec.channels = 2;
+    aspec.format = AUDIO_F32;
+    aspec.freq = 44100;
+    aspec.samples = 1024;
+    SDL_AudioSpec obtaied = {};
+    auto id = SDL_OpenAudioDevice(config.audioDevice, 0, &aspec, &obtaied, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE|SDL_AUDIO_ALLOW_SAMPLES_CHANGE);
+    if (id < 1) {
+        snprintf(buff, sizeof(buff), "SDL Error create audio: %s\n", SDL_GetError());
+        throw std::runtime_error(buff);
+    }
+    _audio.reset(reinterpret_cast<void *>(id));
+
+    return {obtaied.freq};
+}
+void SDLContext::pause_audio(bool pause) {
+    SDL_AudioDeviceID id = reinterpret_cast<std::intptr_t>(_audio.get());
+    SDL_PauseAudioDevice(id, pause?1:0);
+}
+
+void SDLContext::close_audio() {
+    _audio.reset();
+}
diff --git a/platform/sdl/sdl_context.h b/platform/sdl/sdl_context.h
index 8a433da..70fd5d2 100644
--- a/platform/sdl/sdl_context.h
+++ b/platform/sdl/sdl_context.h
@@ -15,7 +15,7 @@ public:
 
     SDLContext();
 
-    struct Config {
+    struct VideoConfig {
         int window_width;
         int window_height;
         bool crt_filter;
@@ -26,11 +26,22 @@ public:
         int aspect_y;
     };
 
+    struct AudioConfig {
+        const char *audioDevice;
+    };
 
-    void init_video(const Config &config, const char *title);
+    struct AudioInfo {
+        int freq;
+    };
+
+    void init_video(const VideoConfig &config, const char *title);
 
     void close_video();
 
+    AudioInfo init_audio(const AudioConfig &config, SDL_AudioCallback cb, void *cb_ctx);
+    void pause_audio(bool pause);
+    void close_audio();
+
 
     void present_rect(uint16_t *pixels, unsigned int pitch, unsigned int x, unsigned int y, unsigned int xs,unsigned ys);
     void swap_render_buffers();
@@ -99,6 +110,12 @@ protected:
         slide_transition
     };
 
+    struct SDL_Audio_Deleter {
+        void operator()(void *x);
+    };
+
+
+
 
     MS_EVENT ms_event;
     mutable std::mutex _mx;
@@ -112,6 +129,7 @@ protected:
     std::unique_ptr<SDL_Texture, SDL_Deleter> _texture;
     std::unique_ptr<SDL_Texture, SDL_Deleter> _texture2;
     std::unique_ptr<SDL_Texture, SDL_Deleter> _crt_effect;
+    std::unique_ptr<void, SDL_Audio_Deleter> _audio;
     SDL_Texture *_visible_texture;
     SDL_Texture *_hidden_texture;
 
@@ -125,6 +143,7 @@ protected:
     std::atomic<bool> _quit_requested = false;
 
 
+
     std::vector<char> _display_update_queue;
     using QueueIter = const char *;
     std::queue<uint16_t> _keyboard_queue;
diff --git a/platform/sdl/sound.cpp b/platform/sdl/sound.cpp
index 8667ffa..9b65ba8 100644
--- a/platform/sdl/sound.cpp
+++ b/platform/sdl/sound.cpp
@@ -1,36 +1,250 @@
 #include "../platform.h"
-#include <libs/zvuk.h>
+#include "../sound.h"
+#include <libs/logfile.h>
+#include "global_context.h"
+
+#include "sound_mixer.h"
+
+#include <cstring>
+#include <iostream>
 
 #include <thread>
-void set_mixing_device(int mix_dev,int mix_freq,...) {
+
+#define countof(array) (sizeof(array)/sizeof(array[0]))
+static void SDLCALL mixing_callback(void *userdata, Uint8 * stream, int len);
+static SoundMixer<2> sound_mixer;
+
+static float master_volume = 1.0;
+static float sound_effect_volume = 1.0;
+static float music_volume = 1.0;
+static float base_freq;
+bool swap_channels = false;
+static void empty_deleter(const void *) {}
+
+constexpr int BACK_BUFF_SIZE = 0x40000;
+static uint8_t *music_buffer = {};
+std::shared_ptr<WaveSource> music_source;
+static std::unique_ptr<IMusicStream> current_music = NULL;
+
+struct VolumePreset {
+    float left = 1.0;
+    float right = 1.0;
+};
+
+static std::unordered_map<int, VolumePreset > channel_volume_presset;
+
+void game_sound_init_device(const INI_CONFIG_SECTION *audio_section) {
+
+    const char *dev = ini_get_string(audio_section, "device", "");
+    if (!dev[0]) dev = nullptr;
+
+    SDLContext::AudioConfig cfg;
+    cfg.audioDevice = dev;
+
+    auto r = get_sdl_global_context().init_audio(cfg, mixing_callback, nullptr);
+    base_freq = r.freq;
+
+
 
 }
+
+static void SDLCALL mixing_callback(void *userdata, Uint8 * stream, int len) {
+    float *s = reinterpret_cast<float *>(stream);
+    int samples = len/8;
+    std::fill(s, s+2*samples, 0.0f);
+    sound_mixer.mix_to_buffer(s, samples);
+}
+
 char start_mixing() {
-    return 0;
+    get_sdl_global_context().pause_audio(false);
+   return 0;
 }
 void stop_mixing() {
+    get_sdl_global_context().pause_audio(true);
 
 }
+
+
+static std::array<float,2> make_channel_volume(float left, float right) {
+    if (swap_channels) std::swap(left, right);
+    return {
+        left * master_volume * sound_effect_volume,
+        right * master_volume * sound_effect_volume,
+    };
+}
+
 void play_sample(int channel,const void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type) {
+    float speed = sfreq/base_freq;
+    int step = type==1?1:2;
+    auto samples = size/step;
+    auto start = lstart/step;
+    WaveSource::Format fmt = step==1?WaveSource::Format::uint8:WaveSource::Format::int16;
+    auto src = std::make_shared<WaveSource>(WaveSource::WavePtr(sample,&empty_deleter),fmt,speed,samples,start);
+
+    VolumePreset &vp = channel_volume_presset[channel];
+
+
+
+
+    sound_mixer.set_track(channel, WaveMixer<2>(src, make_channel_volume(vp.left, vp.right), 1.0));
 
 }
 void set_channel_volume(int channel,int left,int right) {
-
+    float l = left / 32768.0;
+    float r = right / 32768.0;
+    VolumePreset &vp = channel_volume_presset[channel];
+    vp.left = l;
+    vp.right = r;
+    sound_mixer.visit_track(channel, [&](WaveMixer<2> &mx){
+        mx.set_channel_volumes_fade(make_channel_volume(vp.left, vp.right), {2e-4,2e-4});
+    });
 }
-void set_end_of_song_callback(const char * (*cb)(void *), void *ctx) {
 
+static size_t music_buffer_write_pos = 0;
+
+
+size_t copy_to_music_buffer(const void *data, size_t data_size) {
+    size_t rdpos = music_source->get_output_position_bytes();
+    if (static_cast<std::make_signed_t<std::size_t> >(rdpos) < 0) return 0;
+    size_t l = music_source->length_bytes();
+    size_t space = rdpos < music_buffer_write_pos?l - music_buffer_write_pos: rdpos - music_buffer_write_pos;
+    if (space == 0) return 0;
+    data_size = std::min(space,data_size);
+    std::memcpy(music_buffer+music_buffer_write_pos, data, data_size);
+    music_buffer_write_pos += data_size;
+    if (music_buffer_write_pos >= l) {
+        music_buffer_write_pos = 0;
+    }
+    return data_size;
+}
+
+
+static const char * (*end_of_song_callback)(void *ctx) = NULL;
+static void *end_of_song_callback_ctx = NULL;
+
+void set_end_of_song_callback(const char * (*cb)(void *), void *ctx) {
+    end_of_song_callback = cb;
+    end_of_song_callback_ctx = ctx;
 }
 
 void fade_music() {
+    std::lock_guard _(music_source->get_lock());
+    size_t rdpos = music_source->get_output_position_samples();
+    WaveSource::StereoInt16 *rdptr = reinterpret_cast<WaveSource::StereoInt16 *>(music_buffer);
+    size_t wrsamples = music_buffer_write_pos / sizeof(WaveSource::StereoInt16);
+    size_t l =music_source->length();
+    float_t size = (rdpos < wrsamples?0:l) + wrsamples - rdpos;
+    for (size_t i = 0; i < size; ++i) {
+        float fact = (size - i)/size;
+        rdptr[rdpos].left = rdptr[rdpos].left * fact;
+        rdptr[rdpos].right = rdptr[rdpos].right * fact;
+        ++rdpos;
+        if (rdpos >=l) rdpos = 0;
+    }
+}
+
+constexpr int music_track_id_base = 0x1000;
+
+static void music_buffer_deleter(const void *ptr) {
+    uint8_t *p = reinterpret_cast<uint8_t *>(const_cast<void *>(ptr));
+    delete [] p;
+}
+
+static void stop_music() {
+    if (music_source) {
+        std::lock_guard _(music_source->get_lock());
+        size_t l =music_source->length_bytes();
+        size_t rdpos = music_source->get_output_position_bytes();
+        size_t size = (rdpos < music_buffer_write_pos?0:l) +  music_buffer_write_pos - rdpos;
+        music_source->stop_after_bytes(size);
+    }
+    music_source.reset();
+}
+
+void create_new_music_track(int freq) {
+    stop_music();
+    static int track_id = music_track_id_base;
+    double basef = base_freq;
+    double rel_speed = freq/basef;
+    music_buffer = new uint8_t[BACK_BUFF_SIZE];
+    std::memset(music_buffer, 0, BACK_BUFF_SIZE);
+    music_source = std::make_shared<WaveSource>(
+            WaveSource::WavePtr(music_buffer,music_buffer_deleter),
+            WaveSource::Format::stereo_int16, rel_speed,
+            BACK_BUFF_SIZE/sizeof(WaveSource::StereoInt16),0);
+
+    sound_mixer.set_track(track_id, WaveMixer<2>(music_source,{music_volume,music_volume},1.0));
+    track_id = track_id ^ 1;
+    music_buffer_write_pos = BACK_BUFF_SIZE/2;
+}
+
+static std::unique_ptr<IMusicStream> load_music_ex(const char *name) {
+    if (name) {
+        TMUSIC_STREAM *stream = music_open(name);
+        if (stream) {
+            TMUSIC_STREAM_INFO nfo = music_get_info(stream);
+            if (nfo.channels != 2) {
+                SEND_LOG("(MUSIC) Reject music - only stereo is supported");
+            } else if (nfo.format != 2){
+                SEND_LOG("(MUSIC) Reject music - only 16bit is supported");
+            } else {
+                return std::unique_ptr<IMusicStream>(static_cast<IMusicStream *>(stream));
+            }
+        }
+    }
+    return {};
 
 }
-int mix_back_sound(int synchro) {
-    return 0;
+
+static void handle_end_of_song() {
+    current_music.reset();
+    if (end_of_song_callback != NULL) {
+        const char *new_music = end_of_song_callback(end_of_song_callback_ctx);
+        current_music = load_music_ex(new_music);
+        if (current_music) {
+            auto nfo = current_music->get_info();
+            create_new_music_track(nfo.freq);
+            mix_back_sound(0);
+        }
+    }
+}
+
+int mix_back_sound(int _) {
+
+    if (current_music==NULL) {
+        stop_music();
+    } else {
+        auto data = current_music->read();
+        while (!data.empty()) {
+            auto sz = copy_to_music_buffer(data.data(), data.size());
+            if (sz == 0) {
+                current_music->put_back(data);
+                break;
+            }
+            data = data.substr(sz);
+            if (data.empty()) data = current_music->read();
+        }
+        if (data.empty()) {
+            handle_end_of_song();
+            return mix_back_sound(_);
+        }
+    }
+    return 1;
+
 }
 
 //int open_backsound(char *filename);
 void change_music(const char *filename) {
-
+    if (music_source) {
+        fade_music();
+        stop_music();
+    }
+    current_music = load_music_ex(filename);
+    if (current_music) {
+        auto nfo = current_music->get_info();
+        create_new_music_track(nfo.freq);
+        mix_back_sound(0);
+    }
 }
 
 //char *device_name(int device);
@@ -39,29 +253,67 @@ void change_music(const char *filename) {
 //void set_backsnd_freq(int freq);
 
 char get_channel_state(int channel) {
-    return 0;
+    char c = 0;
+    sound_mixer.visit_track(channel, [&](auto){c = 1;});
+    return c;
 }
 void get_channel_volume(int channel,int *left,int *right) {
-
+    VolumePreset &vp = channel_volume_presset[channel];
+    *left = static_cast<int>(vp.left*32768.0);
+    *right = static_cast<int>(vp.right*32768.0);
 }
 void mute_channel(int channel) {
-
+    sound_mixer.visit_track(channel, [&](WaveMixer<2> &mx){
+        mx.get_source()->stop();
+    });
 }
 void chan_break_loop(int channel) {
+    sound_mixer.visit_track(channel, [&](WaveMixer<2> &mx){
+        mx.get_source()->break_loop();
+    });
 
 }
 void chan_break_ext(int channel,const void *org_sample,int32_t size_sample) {
+    sound_mixer.visit_track(channel, [&](WaveMixer<2> &mx){
+        auto src = mx.get_source();
+        src->break_loop(src->length_in_samples(src->get_format(), size_sample));
+    });
 
 }
 
-char set_snd_effect(int funct,int data) {
+
+static void update_music_volume(){
+    float v = music_volume * master_volume;
+    for (int i = 0; i <2; i++)
+        sound_mixer.visit_track(music_track_id_base+i,[&](WaveMixer<2> &m){
+        m.set_channel_volume(v, v);
+    });
+}
+
+char set_snd_effect(AUDIO_PROPERTY funct,int data) {
+    switch (funct) {
+        case SND_PING: break;
+        case SND_GFX: sound_effect_volume = data/256.0;break;
+        case SND_MUSIC: music_volume = data/128.0;update_music_volume();break;
+        case SND_GVOLUME: master_volume = data/256.0;update_music_volume();break;
+        case SND_SWAP: swap_channels = !!data;break;
+        default: return 0;
+    }
+    return 1;
+}
+char check_snd_effect(AUDIO_PROPERTY funct) {
+    if (funct == SND_PING|| funct == SND_GFX || funct == SND_MUSIC || funct == SND_GVOLUME) return 1;
     return 0;
 }
-char check_snd_effect(int funct) {
-    return 0;
-}
-int  get_snd_effect(int funct) {
-    return 0;
+int  get_snd_effect(AUDIO_PROPERTY funct) {
+    switch (funct) {
+        case SND_PING: return 1;
+        case SND_GFX: return static_cast<int>(sound_effect_volume * 256.0);break;
+        case SND_MUSIC: return static_cast<int>(music_volume * 128.0);break;
+        case SND_GVOLUME: return static_cast<int>(master_volume * 256.0);break;
+        case SND_SWAP:return swap_channels?1:0;
+        default: return 0;
+    }
 }
 
 void *PrepareVideoSound(int mixfreq, int buffsize) {
diff --git a/platform/sdl/sound.h b/platform/sdl/sound.h
deleted file mode 100644
index b1f0614..0000000
--- a/platform/sdl/sound.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- * sound.h
- *
- *  Created on: 26. 1. 2025
- *      Author: ondra
- */
-
-#ifndef PLATFORM_SDL_SOUND_H_
-#define PLATFORM_SDL_SOUND_H_
-
-
-
-
-
-#endif /* PLATFORM_SDL_SOUND_H_ */
diff --git a/platform/sdl/sound_mixer.h b/platform/sdl/sound_mixer.h
new file mode 100644
index 0000000..8245f6c
--- /dev/null
+++ b/platform/sdl/sound_mixer.h
@@ -0,0 +1,104 @@
+#pragma once
+#include "wave_mixer.h"
+
+#include <algorithm>
+#include <optional>
+#include <vector>
+
+template<int channels>
+class SoundMixer {
+public:
+
+
+    void mix_to_buffer(float *buffer, std::size_t samples_len) {
+        std::lock_guard _(_mx);
+        for (std::size_t i = 0; i < _tracks.size(); ++i) {
+            Track &t = _tracks[i];
+            bool playing = t.wave.output_mix(buffer, samples_len);
+            if (!playing) {
+                Track &b = _tracks.back();
+                if (&b != &t) std::swap(b,t);
+                _tracks.pop_back();
+                --i;
+            }
+        }
+    }
+
+    template<std::invocable<WaveMixer<channels> &> Fn>
+    bool visit_track(int trackID, Fn &&fn) {
+        std::lock_guard _(_mx);
+        Track *t = find_track_by_id(trackID);
+        if (t) {
+            fn(t->wave);
+            return true;
+        } else {
+            return false;
+        }
+
+    }
+    template<std::invocable<const WaveMixer<channels> &> Fn>
+    bool visit_track(int trackID, Fn &&fn) const {
+        std::lock_guard _(_mx);
+        const Track *t = find_track_by_id(trackID);
+        if (t) {
+            fn(t->wave);
+            return true;
+        } else {
+            return false;
+        }
+
+    }
+
+    void set_track(int trackID, WaveMixer<channels> wave) {
+        std::lock_guard _(_mx);
+        Track *t = find_track_by_id(trackID);
+        if (t) t->wave = std::move(wave);
+        else _tracks.push_back({trackID, std::move(wave)});
+    }
+
+    struct Track {
+        int trackID;
+        WaveMixer<channels> wave;
+    };
+
+
+    void set_tracks(Track *tracks, int count) {
+        std::lock_guard _(_mx);
+        for (int i = 0; i < count; ++i) {
+            Track *t = find_track_by_id(tracks[i].trackID);
+            if (t) t->wave = std::move(tracks[i].wave);
+            else _tracks.push_back(std::move(tracks[i]));
+        }
+    }
+
+
+protected:
+
+    Track *find_track_by_id(int track) {
+        auto iter = std::find_if(_tracks.begin(), _tracks.end(), [&](const Track &t){
+            return t.trackID == track;
+        });
+        if (iter == _tracks.end()) {
+            return nullptr;
+        } else {
+            return &(*iter);
+        }
+    }
+
+    const Track *find_track_by_id(int track) const {
+        auto iter = std::find_if(_tracks.begin(), _tracks.end(), [&](const Track &t){
+            return t.trackID == track;
+        });
+        if (iter == _tracks.end()) {
+            return nullptr;
+        } else {
+            return &(*iter);
+        }
+    }
+
+
+    std::mutex _mx;
+    std::vector<Track> _tracks;
+
+
+};
diff --git a/platform/sdl/wave_mixer.h b/platform/sdl/wave_mixer.h
new file mode 100644
index 0000000..191b6dd
--- /dev/null
+++ b/platform/sdl/wave_mixer.h
@@ -0,0 +1,145 @@
+#pragma once
+#include "wave_source.h"
+
+#include <atomic>
+
+
+template<typename X>
+class NoCopyObject: public X {
+public:
+    using X::X;
+
+    NoCopyObject(const NoCopyObject &other):X() {}
+    NoCopyObject &operator=(const NoCopyObject &other) {
+        return *this;
+    }
+};
+
+template<int channels>
+class WaveMixer {
+public:
+
+    enum State {
+        playing,
+        done
+    };
+
+    WaveMixer(std::shared_ptr<WaveSource> source)
+        :_src(std::move(source)) {}
+    WaveMixer(std::shared_ptr<WaveSource> source, const std::array<float,channels> &volumes, float speed = 1.0)
+        :_src(std::move(source))
+        ,_volume{volumes}
+        ,_speed(speed) {}
+
+
+
+    static_assert(channels > 0);
+
+
+    ///output to buffer by adding values (mixing)
+    /**
+     * @param buffer sound buffer - add values here
+     * @param samples_count count of samples in buffer (so samples * channels for count of floats)
+     * @retval true still playing
+     * @retval false done playing
+     */
+    bool output_mix(float *buffer, std::size_t samples_count)  {
+        std::array<float, channels> vol;
+        float speed;
+        {
+            std::lock_guard _(_mx);
+            if (_state == done) {
+                return 0;
+            }
+            vol = _volume;
+            speed = _speed;
+        }
+
+        bool ch = false;
+
+        auto do_volume_fade = [this,&ch](int c){
+            float d = _target_volume[c] - _volume[c];
+            if (d > 0) {
+                d = std::min(d, _volume_change[c]);
+                ch = true;
+            }
+            else if (d < 0) {
+                d = std::max(d, -_volume_change[c]);
+                ch = true;
+            }
+            _volume[c] += d;
+        };
+
+        auto iter = buffer;
+        bool playing = _src->output([&](const auto &value){
+            using T = std::decay_t<decltype(value)>;
+            if constexpr (std::is_same_v<T, float>) {
+                for (int c = 0; c < channels; ++c) {
+                    if (_volume_fade) do_volume_fade(c);
+                    float v = value * vol[c];
+                    v = v + (*iter);
+                    (*iter) = v;
+                    ++iter;
+                }
+            } else {
+                //TODO: handle 1 channel audio
+                static_assert(std::is_same_v<T, WaveSource::StereoFloat>);
+                if (_volume_fade) for (int c  =0; c< channels; ++c) do_volume_fade(c);
+                if constexpr(channels == 1) {
+                    float v = (value.left + value.right) * 0.5;
+                    (*iter) += v * vol[0];
+                } else {
+                    (*iter) += value.left * vol[0];
+                    ++iter;
+                    (*iter) += value.right * vol[0];
+                    ++iter;
+                }
+            }
+
+        }, samples_count, speed);
+        _volume_fade = ch;
+        return playing;
+    }
+
+    void set_channel_volumes(const std::array<float,channels> &volumes) {
+        std::lock_guard _(_mx);
+        _volume = volumes;
+    }
+
+    void set_channel_volumes_fade(const std::array<float,channels> &volumes, const std::array<float,channels> &change_speed) {
+        std::lock_guard _(_mx);
+        _volume_fade = true;
+        _target_volume = volumes;
+        _volume_change = change_speed;
+    }
+
+    void set_channel_volume(int channel, float volume) {
+        std::lock_guard _(_mx);
+        if (channel >= 0 && channel < channels) {
+            _volume[channel] = volume;
+        }
+    }
+
+    void set_speed(float speed) {
+        std::lock_guard _(_mx);
+        _speed = speed;
+    }
+
+    std::shared_ptr<WaveSource> get_source() const {return _src;}
+
+protected:
+
+
+
+    std::shared_ptr<WaveSource> _src;
+    mutable  NoCopyObject<std::mutex> _mx;
+    std::array<float, channels> _volume = {};
+    std::array<float, channels> _target_volume = {};
+    std::array<float, channels> _volume_change = {};
+    bool _volume_fade = false;
+    float _speed = 1.0;
+    State _state = playing;
+
+
+
+};
diff --git a/platform/sdl/wave_source.h b/platform/sdl/wave_source.h
new file mode 100644
index 0000000..92c1bde
--- /dev/null
+++ b/platform/sdl/wave_source.h
@@ -0,0 +1,248 @@
+#pragma once
+#include <atomic>
+#include <cmath>
+#include <cstdint>
+#include <memory>
+#include <mutex>
+
+
+class WaveSource {
+public:
+    using WaveDeleter = void (*)(const void *);
+    using WavePtr = std::unique_ptr<const void, WaveDeleter>;
+
+    struct StereoInt16 {
+        std::int16_t left;
+        std::int16_t right;
+    };
+
+    struct StereoFloat {
+        float left;
+        float right;
+    };
+
+    enum class Format {
+        uint8,
+        int8,
+        uint16,
+        int16,
+        stereo_int16
+    };
+
+    constexpr static std::size_t length_in_samples(Format f, std::size_t bytes) {
+        if (f == Format::stereo_int16) return bytes>>2;
+        if (f == Format::uint16 || f == Format::int16) return bytes>>1;
+        else return bytes;
+    }
+    constexpr static std::size_t length_in_bytes(Format f, std::size_t samples) {
+        if (f == Format::stereo_int16) return samples<<2;
+        if (f == Format::uint16 || f == Format::int16) return samples<<1;
+        else return samples;
+
+    }
+    Format get_format() const {return _format;}
+
+    ///retrieve overall play time in samples of source wave
+    /**
+     * @return play time in samples  - this value can be non-integer - when pointer
+     * can point between two samples
+     *
+     */
+    double get_play_time() const {
+        return _position;
+    }
+    ///retrieves output position in samples.
+    /** useful for cycle buffer returns sample index in wave buffer which has been
+     * recently sent to the wave device, so it is save to overwrite it. As the
+     * @return output position in samples
+     */
+    std::size_t get_output_position_samples() const {
+        std::lock_guard _(_mx);
+        return static_cast<std::size_t>(std::round(wrap_pos(_position - 1.0)));
+    }
+
+    ///retrieves output position in samples.
+    /** useful for cycle buffer returns byte offset in wave buffer which has been
+     * recently sent to the wave device, so it is save to overwrite it. As the
+     * @return output position in bytes
+     */
+    std::size_t get_output_position_bytes() const {
+        return length_in_bytes(_format,get_output_position_samples());
+    }
+
+    ///break loop - so wave finishes current cycle and ends
+    void break_loop() {
+        std::lock_guard _(_mx);
+        break_loop_finish_at(_length);
+    }
+
+    ///break loop by extending play beyond the loop - must be already defined in wave buffer
+    void break_loop(std::size_t final_len) {
+        std::lock_guard _(_mx);
+        break_loop_finish_at(final_len);
+    }
+
+    ///stop playing now
+    void stop() {
+        std::lock_guard _(_mx);
+        _wrap_offset = _position - _length;
+        _loop_pos = _length;
+    }
+
+    ///stops playing after given samples played
+    void stop_after_samples(std::size_t pos) {
+        std::lock_guard _(_mx);
+        _stop_at = _position + pos;
+    }
+    ///stops playing after given bytes played
+    void stop_after_bytes(std::size_t pos) {
+        stop_after_samples(length_in_samples(_format, pos));
+    }
+    std::size_t length() const {return _length;}
+    std::size_t length_bytes() const {return length_in_bytes(_format, _length);}
+
+
+    ///create wave source
+    /**
+     * @param data pointer to data, can be allocated or static, depend on deleter
+     * @param format format - one of enum
+     * @param speed frequency in ratio to base frequency. For instance if base frequency is 44100
+     *          and wave frequency is 11025, then speed is 0.25
+     * @param len_samples count of samples
+     * @param loop_pos
+     */
+    WaveSource(WavePtr data, Format format, double speed, std::size_t len_samples, std::size_t loop_pos)
+    :_wave(std::move(data))
+    ,_format(format)
+    ,_speed(speed)
+    ,_length(len_samples)
+    ,_loop_pos(std::min(loop_pos, len_samples))
+    {
+    }
+
+
+
+
+    template<std::invocable<float> Fn>
+    bool output(Fn &&fn, std::size_t samples, double speed = 1.0) {
+        std::lock_guard _(_mx);
+        switch (_format) {
+            case Format::int8: return do_output(std::forward<Fn>(fn),
+                    reinterpret_cast<const std::int8_t *>(_wave.get()),
+                    samples, speed) > 0;
+            case Format::int16: return do_output(std::forward<Fn>(fn),
+                    reinterpret_cast<const std::int16_t *>(_wave.get()),
+                    samples, speed) > 0;
+            case Format::uint8: return do_output(std::forward<Fn>(fn),
+                    reinterpret_cast<const std::uint8_t *>(_wave.get()),
+                    samples, speed) > 0;
+            case Format::uint16: return do_output(std::forward<Fn>(fn),
+                    reinterpret_cast<const std::uint16_t *>(_wave.get()),
+                    samples, speed) > 0;
+            case Format::stereo_int16: return do_output(std::forward<Fn>(fn),
+                    reinterpret_cast<const StereoInt16 *>(_wave.get()),
+                    samples, speed) > 0;
+        }
+        return false;
+
+    }
+
+
+
+
+
+
+
+
+
+
+    ///for locking buffer - but probably not needed if you use memory barriers
+    std::recursive_mutex &get_lock() {return _mx;}
+
+protected:
+    mutable std::recursive_mutex _mx;
+    WavePtr _wave;
+    Format _format;
+    double _speed;
+    double _length;
+    double _loop_pos;
+    double _position = 0;
+    double _wrap_offset = 0;
+    double _interpolation_step = 1.0;
+    double _stop_at = std::numeric_limits<double>::max();
+
+
+
+    constexpr float interpolate(float s1, float s2, float frac) {
+        return s1 + (s2 - s1) * frac;
+    }
+
+    constexpr float interpolate(uint8_t s1, uint8_t s2, float frac) {
+        float sampl1 = static_cast<float>(s1)/static_cast<float>(128)- 1.0f;
+        float sampl2 = static_cast<float>(s2)/static_cast<float>(128)- 1.0f;
+        return interpolate(sampl1, sampl2, frac);
+    }
+    constexpr float interpolate(uint16_t s1, uint16_t s2, float frac) {
+        float sampl1 = static_cast<float>(s1)/static_cast<float>(32768) - 1.0f;
+        float sampl2 = static_cast<float>(s2)/static_cast<float>(32768) - 1.0f;
+        return interpolate(sampl1, sampl2, frac);
+    }
+
+    constexpr float interpolate(int16_t s1, int16_t s2, float frac) {
+        float sampl1 = static_cast<float>(s1)/static_cast<float>(32768);
+        float sampl2 = static_cast<float>(s2)/static_cast<float>(32768);
+        return interpolate(sampl1, sampl2, frac);
+    }
+    constexpr StereoFloat interpolate(const StereoInt16 &s1, const StereoInt16 &s2, float frac) {
+        return {
+            interpolate(s1.left, s1.left, frac),
+            interpolate(s2.right, s2.right, frac)
+        };
+    }
+    constexpr float interpolate(int8_t s1, int8_t s2, float frac) {
+        float sampl1 = static_cast<float>(s1)/static_cast<float>(128);
+        float sampl2 = static_cast<float>(s2)/static_cast<float>(128);
+        return interpolate(sampl1, sampl2, frac);
+    }
+
+
+    template<typename T, typename Fn >
+    std::size_t do_output(Fn &&fn, const T *wave, std::size_t samples, double speed) {
+        float spd = speed * _speed;
+        for (std::size_t i = 0; i < samples; ++i) {
+            if (_position>= _stop_at) {
+                return i;
+            }
+            double p = wrap_pos(_position - _wrap_offset);
+            double sp;
+            double fp = std::modf(p,&sp);
+            std::size_t s1 = static_cast<std::size_t>(wrap_pos(sp));
+            std::size_t s2 = static_cast<std::size_t>(wrap_pos(sp+1));
+            if (s1 == s2) return i;
+            fn(interpolate(wave[s1], wave[s2], fp));
+            _position = _position + spd;
+        }
+        return samples;
+    }
+
+
+    double wrap_pos(double position) const {
+        if (position >= _length) {
+            if (_loop_pos == _length) {
+                position = _length;
+            } else {
+                position = std::fmod((position - _length),(_length - _loop_pos)) + _loop_pos;
+            }
+        }
+        return position;
+    }
+
+
+    void break_loop_finish_at(double position) {
+        double adj = wrap_pos(_position);
+        _wrap_offset = _position - adj;
+        _loop_pos = _length = position;
+    }
+
+};
+
diff --git a/platform/sound.h b/platform/sound.h
new file mode 100644
index 0000000..42f4531
--- /dev/null
+++ b/platform/sound.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "../libs/music.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+
+SND_PING,
+SND_GVOLUME,
+SND_BASS,
+SND_TREBL,
+SND_SWAP,
+SND_LSWAP,
+SND_SURROUND,
+SND_OUTFILTER,
+SND_GFX,
+SND_MUSIC,
+SND_XBASS,
+
+SND_MAXFUNCT} AUDIO_PROPERTY;
+
+void game_sound_init_device(const INI_CONFIG_SECTION *audio_section);
+
+char start_mixing();
+void stop_mixing();
+void play_sample(int channel,const void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type);
+void set_channel_volume(int channel,int left,int right);
+void set_end_of_song_callback(const char * (*cb)(void *), void *ctx);
+void fade_music();
+int mix_back_sound(int synchro);
+void change_music(const char *filename);
+char get_channel_state(int channel);
+void get_channel_volume(int channel,int *left,int *right);
+void mute_channel(int channel);
+void chan_break_loop(int channel);
+void chan_break_ext(int channel,const void *org_sample,int32_t size_sample);
+char set_snd_effect(AUDIO_PROPERTY funct,int data);
+char check_snd_effect(AUDIO_PROPERTY funct);
+int  get_snd_effect(AUDIO_PROPERTY funct);
+void *PrepareVideoSound(int mixfreq, int buffsize) ;
+char LoadNextVideoFrame(void *buffer, const char *data, int size, const short *xlat, short *accnums, int32_t *writepos);
+void DoneVideoSound(void *buffer);
+const char *device_name(int );
+
+
+#ifdef __cplusplus
+}
+#endif