[PATCH v2] Pioneer devices: engage implicit feedback sync for playback

[Olivia Mackintosh]

> Which kernel version have you tested?  There have been quite a few
> development about USB-audio recently, so something might be missing or
> conflicting?  Let's see.

I have just tested d86f43b17ed4cd751f73d890ea63f818ffa5ef3d with and
without the patch:

  - Without the patch, everything works fine.
  - With the patch, speaker-test times out. I'll try to collect some more
    infomation from dyndb and try to have a look to see what the problem
    is.

There's no obvious mistakes in the patch as far as I can tell.

Olivia