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

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 13 Dec 2022 15:49:55 UTC

--- Comment #19 from Florian Walpen <dev@submerge.ch> ---
(In reply to mburetorp from comment #18)

Ok, so firefox doesn't play through pulseaudio, and opens a vchan for playback.
The big difference in the "fixed" case is that pulseaudio seems to create
additional vchans for playback _and_ recording. Curiously both at 44.1kHz
instead of 48kHz.

Maybe the vchan processing has a problem which gets worked around by the
additional processing nodes in the graph. Or maybe the hardware likes to run in
duplex and any open recording channel fixes that.

To check this, you could try to run virtual_oss in playback only mode (-P
instead of -f I think) and see if the buzz is there again.

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