> Sadly USB Support for Amiga is not as advanced as I thought it was.
Make that "MorphOS" instead of "Amiga":
"As world's first Amiga Classic USB controller the DENEB supports real time isochronous data transfer and hence allows using inexpensive USB sound cards with a new audio class driver available in Poseidon V4.0." http://morph.zone/modules/news/article_storyid_1501.html
Interestingly, MorphOS 1.x had support for isochronous USB transfers on the Pegasos via uhciusb.device, which was obsoleted in MorphOS 2.0 with its from-scratch reimplementation of UHCI/OHCI/EHCI support in pciusb.device:
