don't auto-remove sound output devices

[ronso0]

with 2.3 I just experienced the following inconvenience:
1 start Mixxx with main & booth outputs configured:
  Main: pulse chan.1/2, Booth pulse chan.3/4
2 start AutoDJ
3 sound crackles (underruns in dev mode)
while playing:
4 Preferences > Sound > double buffer size > Apply
5 sound stops (expected), settings applied, hit Okay
6 playback freezes, playposition stuck
 ?
7 Preferences > Sound:
  Main output is cleared, Booth uses pulse chan.1/2
 ?

[Daniel Schürmann (daschuer)]

I can confirm these issues using the pulse device.
It is an ALSA device that is routed back to pulse and again to ALSA to the final destination.
A long stack with limited feedback to Mixxx.

For low latency it is recommended to use the ALSA devices directly anyway. I am in doubt that this is obvious for all users. :-/

There is also an experimental branch that allows Mixxx to directly connect to PulseAudio.
https://github.com/PortAudio/portaudio/pull/336

I am waiting for a merge to upstream PortAudio for long. I would be happy if you can test it and share your experiences.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/10187