diff --git a/lumps/genmidi/genmidi.py b/lumps/genmidi/genmidi.py
index 93d6204f..92ccc851 100644
--- a/lumps/genmidi/genmidi.py
+++ b/lumps/genmidi/genmidi.py
@@ -78,7 +78,7 @@ def encode_instrument(instrument):
     else:
         fixed_note = 0
 
-    header = struct.pack("<hBB", flags, 128, fixed_note)
+    header = struct.pack("<hBB", flags, 128 + instrument.tune, fixed_note)
 
     return header + instr1_data + instr2_data
 
@@ -149,7 +149,8 @@ def decode_instrument(data, name):
         fixed_note = None
 
     return Instrument(
-        voice1, voice2, off1=offset1, off2=offset2, note=fixed_note
+        voice1, voice2, off1=offset1, off2=offset2, note=fixed_note,
+        tune=finetune - 128
     )
 
 
diff --git a/lumps/genmidi/instrument.py b/lumps/genmidi/instrument.py
index 226e1aee..15d5ecf8 100644
--- a/lumps/genmidi/instrument.py
+++ b/lumps/genmidi/instrument.py
@@ -56,7 +56,7 @@ def load_instrument(filename):
 
 
 class Instrument:
-    def __init__(self, file1, file2=None, off1=0, off2=0, note=None):
+    def __init__(self, file1, file2=None, off1=0, off2=0, note=None, tune=0):
         self.voice1 = load_instrument(file1)
 
         if file2 is not None:
@@ -67,6 +67,7 @@ class Instrument:
         self.fixed_note = note
         self.offset1 = off1
         self.offset2 = off2
+        self.tune = tune
 
 
 NullInstrument = Instrument("dummy.sbi")