Index: uspace/drv/audio/sb16/mixer_iface.c
===================================================================
--- uspace/drv/audio/sb16/mixer_iface.c	(revision 25c98a8e68b8c4ccbb559de38fec247485ace683)
+++ uspace/drv/audio/sb16/mixer_iface.c	(revision deff6b4d27fd30fe2c528823ee009c0444a8b5f8)
@@ -87,5 +87,8 @@
     unsigned volume)
 {
-	return ENOTSUP;
+	assert(fun);
+	assert(fun->driver_data);
+	const sb_mixer_t *mixer = fun->driver_data;
+	return sb_mixer_set_volume_level(mixer, item, channel, volume);
 }
 /*----------------------------------------------------------------------------*/