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hi,

you must always tell the exact and intended device to JACK as its main and primary sound device; otherwise it takes the first or default which often is the internal one (hda intel?) and not the USB or any other you may have...

reckoning you're on pipewire and not genuine jackd, you'll have to tell pipewire/jack.conf which device is your primary (USB?) for all pipewire-jack purposes.

I can't help you much further here (re. pipewire configuration) sorry; if it were genuine-jackd(bus) it would be done, for instance, in qjackctl / Setup / Settings / Parameters / Interface set to "hw:USB" perhaps, but it would depend on how exactly your system names the device in question; but not like so in PW, so sorry.

maybe you need pipewire-pulse and pavucontrol installed too, and then on the later, selecting an appropriate profile/device will do the trick?

ask the PW forums, and then share the knowledge, if you reach a verdict ;)

hth. cheers