Thanks Stephen, probe_mask=-1,0x2 works fine for me. I thought this was a pulse-issue, but apparently it's more complex than that. I happen to use pavumixer all the time, the gnome sound-preferences work but screw up read/front and left/right for me. Seems more intuitive and well-designed to me than any other mixer-app so far! I'm going to send the icon in question to Colin. Christopher