diff --git a/src/tic.c b/src/tic.c
index 1b9fb88..189c18e 100644
--- a/src/tic.c
+++ b/src/tic.c
@@ -295,10 +295,11 @@ static void channelSfx(tic_mem* memory, s32 index, s32 note, s32 octave, s32 dur
 
 	c->volume = volume;
 
-    {
-        struct {s8 speed:SFX_SPEED_BITS;} temp = {speed};
-        c->speed = speed == temp.speed ? speed : machine->soundSrc->sfx.data[index].speed;
-    }
+	if(index >= 0)
+	{
+		struct {s8 speed:SFX_SPEED_BITS;} temp = {speed};
+		c->speed = speed == temp.speed ? speed : machine->soundSrc->sfx.data[index].speed;
+	}
 
 	// start index of idealized piano
 	enum {PianoStart = -8};
@@ -324,7 +325,6 @@ static void resetMusic(tic_mem* memory)
 		musicSfx(memory, -1, 0, 0, 0, c);
 }
 
-
 static void setMusic(tic_machine* machine, s32 index, s32 frame, s32 row, bool loop)
 {
 	tic_mem* memory = (tic_mem*)machine;