When I connect my mixer to my Debian/KDE machine the sound is slowed and pitched down. Sometimes it takes days or weeks until this effect occurs.
Strangely it rarely works after restarting the mixer console. It usually works after restarting it many times.
Once it works I can change the sound output under "Audio Volume" back and forth and it keeps working.
I think it's skewing the sound more often than previously and that I need way more restarts to get it working but I might be wrong.
I already checked if there is a firmware update for my mixer console but it's already the latest version. And I tried changing the Phonon Backend from Phonon VLC to Phonon GStreamer but that didn't help.
/var/log/syslog doesn't seem to have useful messages that are related to the problem.
It's a HID controller (USB, not MIDI) with an onboard soundcard and I'm using ALSA.
aplay -l says the driver is module-alsa-card.c.
Any ideas what might cause this (or how to find out) and how it could be fixed?