diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index b04da0735..37bd99f57 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -3156,13 +3156,17 @@ bool DivInstrument::saveDMP(const char* path) {
 
     w->writeC(std.dutyMacro.len);
     for (int i=0; i<std.dutyMacro.len; i++) {
-      w->writeI(std.dutyMacro.val[i]+12);
+      w->writeI(std.dutyMacro.val[i]);
     }
     if (std.dutyMacro.len>0) w->writeC(std.dutyMacro.loop);
 
     w->writeC(std.waveMacro.len);
     for (int i=0; i<std.waveMacro.len; i++) {
-      w->writeI(std.waveMacro.val[i]+12);
+      if (type==DIV_INS_AY) {
+        w->writeI(std.waveMacro.val[i]-1);
+      } else {
+        w->writeI(std.waveMacro.val[i]);
+      }
     }
     if (std.waveMacro.len>0) w->writeC(std.waveMacro.loop);