@Georg
I just got the idea when I was using qemu with morphos and I wanted to move some data to do some tests
then I tried to mount a usb stick that contained data
with:
-usb -device usb-host, vendorid = 0xeba4, productid = 0x7588

in this case the pen is recognized by morphos and can be used without problems.

So since there is no audio emulation in qemu

I said then it should also recognize a usb-audio stick in the same way.

but it actually seems more complicated than I thought.

And every now and then I do tests to pass the time.

Qemu does not currently support audio with morphos
I can't tell you the reason for this.