Hello there.
I'll be very little help, but thought I'd share my experience on this subject, given the coincidental timing.
I can say that the BR-80
can work as a USB audio interface on Linux, as well as an external storage device - I used it with Fedora 17 (3.9.10-100, I believe) for a while, very successfully (once I'd figured out what this jack lark was all about - all new to me at the time). Since that OS was creaking with its age, I took the decision to upgrade to 25 (4.11.8-200) just a couple of weeks ago, after finishing a project, so I could take advantage of the newer versions of all the software I'm running and since then, I'm rather gutted to say, I've not been able to get the thing working again.
I know I had
some problems on Fedora 17, initially but I'm sure that was mainly around jack (it's a long time ago). Once I had a working config for that I thought I'd be set. lsusb shows the br-80, as does "aplay -l" and "amidi -l" and alsamixer (though there are no controls listed in there for it, I can't remember if there were previously).
But whatever I try I get nothing out of the thing (even tried updating to the latest firmware on the BR-80 itself). Normal, internal soundcard is fine with or without jack. pulseaudio killed and not killed, makes no difference. I use Ardour and the latest version of that lists it in the jack setup but then fails to open it. aplay ... doesn't play, also despite seeing it - just gives an i/o errors after a while, so I'm thinking it's not just my jack ignorance rearing up again.
I get a bit of this...
kernel: usb 1-1.4: Unable to change format on ep #8e: already in use
and the same "JackAudiDriver:: ProcessAsync: read error, stopping...." mentioned above and lsusb -v give a few "UNRECOGNIZED" settings/parameters which don't look encouraging.
Despite that I'm used to fedora and want to stick with it and despite the effort of getting it installed and set up for everything else I use it for, I'm considering switching to AVLinux or KXStudio and seeing if they're any better.
You've probably seen it but this chap seems to be having the same issue with another Boss device....
viewtopic.php?f=6&t=17180&p=82065&hilit ... 300#p82065
Worth keeping an eye on in case he gets anywhere.
If by some fluke I get any progress I'll let you know.
thanks.