For those interested now the usb-audio stick is recognized in Sam460Ex with Morphos.
Aros ppc with Sam460ex also recognizes the USB audio stick
but they don't make any sound at the moment.
Currently Pegasos2 and G4 still suffer from the blocking of the usb-audio stick.
If anyone can do these tests it would be great.
I haven't done any reports to the author of qemu-ppc yet
here a video of a few minutes on the recognition of the usb-audio stick:
https://we.tl/t-LMxlsyj9tt