> I guess UAC1 doesn't need feedback endpoints, right? Seems like that
> should be something specific to UAC2. At least for now.

It seems like it is needed there aswell, see 
http://www.usb.org/developers/docs/devclass_docs/audio10.pdf  (3.7.2.2) 
(Feedback endpoint == Synch Endpoint)

Regards
/R

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