Index: uspace/srv/audio/hound/audio_device.c
===================================================================
--- uspace/srv/audio/hound/audio_device.c	(revision 842eecdd6f82b689a612a0107057725b919e8a61)
+++ uspace/srv/audio/hound/audio_device.c	(revision 7f6d84bd53c97636ae5b7aebaa429c34ca0871e8)
@@ -196,4 +196,6 @@
 		switch(IPC_GET_IMETHOD(call)) {
 		case PCM_EVENT_FRAMES_PLAYED: {
+			struct timeval time1;
+			getuptime(&time1);
 			//TODO add underrun protection.
 			if (dev->buffer.position) {
@@ -209,4 +211,8 @@
 			audio_sink_mix_inputs(&dev->sink, dev->buffer.position,
 			    dev->buffer.size / BUFFER_PARTS);
+			struct timeval time2;
+			getuptime(&time2);
+			log_verbose("Time to mix sources: %li\n",
+			    tv_sub(&time2, &time1));
 			break;
 		}