mayble alsaloop https://man.archlinux.org/man/alsaloop.1.en

As seen here: https://unix.stackexchange.com/questions/405283/alsa-get-audio-from-specific-input-to-specific-output-stream-for-monitoring

By the way the Behringer UMC204HD added a mono/stereo switch, and isn't too much bigger/costlier than the UMC202HD.

Z

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