@@ -85,10 +85,11 @@ Uint8

 apu_get_vu(Apu *c)

 {

 	int i;

-	Sint32 sum[2];

+	Sint32 sum[2] = {0, 0};

 	if(!c->advance || !c->period) return 0;

 	for(i = 0; i < 2; ++i) {

-		sum[i] = envelope(c, c->age) * c->volume[i] / 0x800;

+		if(!c->volume[i]) continue;

+		sum[i] = 1 + envelope(c, c->age) * c->volume[i] / 0x800;

 		if(sum[i] > 0xf) sum[i] = 0xf;

 	}

 	return (sum[0] << 4) | sum[1];