Saw something I didn't expect while debugging my production box; in /proc/asound/cards, an entry named FCA202, which was my Behringer FCA202 firewire interface.  Since when does ALSA do Firewire interfaces?  

I'm tracking a very intermittent freezup bug of some sort, and thought perhaps this ALSA driver was interfering with JACK and its Firewire side, and have blacklisted the driver involved (snd_oxfw) just in case.  It will take a lot of testing to come to an opinion whether or not this eliminated the problem.  

But meanwhile, does this mean that I have the option of using 

JACK-->ALSA-->FCA202 as well as JACK-->Firewire-->FCA202?  

Anyone know which perhaps I should prefer for high performance at low latency?  I'm running 96KHz and liking it a lot...

In case it helps:  kernel 4.1.3 Liquorix, Debian Testing, 64-bit, up to date.