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Date:      Tue, 13 Dec 2022 15:49:55 +0000
From:      bugzilla-noreply@freebsd.org
To:        usb@FreeBSD.org
Subject:   [Bug 268136] [snd_uaudio] Distorted audio from MOTU M4 USB interface
Message-ID:  <bug-268136-19105-8hmRQH0HNW@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-268136-19105@https.bugs.freebsd.org/bugzilla/>
References:  <bug-268136-19105@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D268136

--- 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 playb=
ack.
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 ru=
n 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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