[Bug 268136] [snd_uaudio] Distorted audio from MOTU M4 USB interface

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 12 Dec 2022 00:55:13 UTC

--- Comment #16 from Hans Petter Selasky <hselasky@FreeBSD.org> ---
> BUT then I found out that disabling vchans fixes

Yes, there might be a bug in the kernel sys/dev/sound/pcm layer. There should
be some automagic vchan re-mixing done, when playing back stero on 4-channel
devices. It might be that one of the /dev/dspX ioctls fail, and that pulseaudio
and other apps simply ignore that ... It might be worth ktracing the
applications and grep for the DSP ioctls and see if any have failures.

BTW: I always use virtual_oss with USB audio devices having more than 2


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