[alsa-devel] BOSS GT-1 USB audio and implicit feedback&In-Reply-To=<a3588f5f-b9b2-b622-7f9e-b9d472d88907 at jensverwiebe.de>

[Mike Oliphant]

Jens - actually, I think we have pretty much the same issue. I get no
playback when forcing an implicit feedback endpoint, or when letting the
Roland quirk handle it automatically. If I disable implicit feedback, it
works but I get pops/clicks.

Coincidentally, I just came across this post of yours on the Line6 forums
about manually tweaking the sample rate:

https://line6.com/support/topic/4426-line-6-with-linux/?tab=comments#comment-240302


I gave it a try today, and by forcing a sample rate of 44105 instead of
44100 I now have largely clean playback! I get the odd dropout, but it is
much less frequent (on the order of once every few minutes instead of
several times a second).

This is obviously an non-ideal workaround for the problem. Playback should
be synchronized to the capture stream, but this doesn't seem to be getting
configured correctly for our devices. Why, I'm not sure - I'm gradually
gaining a better understanding of the USB audio kernel code, but I'm not
there yet.

Mike