https://bugs.freedesktop.org/show_bug.cgi?id=92754
--- Comment #20 from Raymond <[email protected]> ---
as your m-audio fasttrack ultra does not have any playback channel map
it is a bug of pulseaudio to allow 2.1 profile when there is no LFE/ channel
map
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/log/sound/usb?qt=grep&q=channel+map
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