I am running Slackware Linux 14.2 (K4.4.88), Audacity 2.1.2, and Pulseaudio 9.0 with an Asus Zonar D2 audio card.
This combination was working with Slackware 14.1 without Pulseaudio. However, now I can’t get the audio monitor (Software Passthrough) to work. With Software Passthrough off, It will record and I can play it back without any problems, but I cannot monitor the recording while it is being played. I am not using the “Monitor” recording option in the Pulse mixer, but it does not seem to make any difference with or without the Monitor option selected. When I start a recording or “Click to start monitoring” with Software Passthrough on, I get a fraction of a second of sound from my speakers, then Audacity stops with both level “meters” frozen at the last sample reading. If I select record with Software Passthrough on, Audacity stops recording in a fraction of a second. With Software Playthrough unchecked (off), the recording or monitoring does not freeze. I suspect it has something to do with Audacity and Pulse, but I am not sure. Is this a known problem and is there anything I can do to fix it?