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    This is absolutely perfect. Exactly what I want. I'm even able to control the sink/source using pavucontrol, and muting via shortcut works too. Thank you very much! Commented Jul 24, 2018 at 16:39
  • I just realized that the pulseaudio process usage is now 11% - constant. That is with only the null-sink active and no live-listening. It's 12% with live listening on. Usually pulseaudio wouldn't even use 1% at all. Is there a way to reduce this? Commented Jul 25, 2018 at 2:16
  • Is that with the loopback active, but muted? If yes, I guess have to stop or unload the loopback stream instead of just muting it. Continuously duplicating a buffer and possibly doing format conversion will incur CPU usage, no matter what you do... Commented Jul 25, 2018 at 5:44
  • It seems that the load was caused mainly by module-null-sink. I'm using alsa's snd-aloop again with your loopback solution and it still works great while CPU usage with live-listening is only 4%, 3% without. Commented Jul 25, 2018 at 15:57