Yep, they are...just as long as you use the right format. XODES has tried to come up with a "universal" tile faceplate, though...and it really seems to end-run that issue.
As to the OP's question about outputs to the DAW's A/D, my suggestion...if this is just going to be a studio rig, you might actually be better off with an Expert Sleepers interface module right there in the cab. The ES-9 comes to mind, in fact...plenty of user programmability, plus it works as a MIDI interface for any class-compliant controller while also having 8 channels of output from the DAW...and with 14 inputs to send audio directly to the DAW via either USB or ADAT Lightpipe. Oh, and it also gives you a stereo pair of isolated analog outs so that you could connect directly from that to the PA desk if you DID want to use it live.
The other cheapo method for this is to use a software package like ES's Silent Way, Ableton Live's CV Tools, etc...and then, your next move would be to snag a used but "obsolete" I/O interface (I use a MOTU 828FW mkii) and then use it as a substitute for the ES-9. This gives you an easy 8-out/8-in, and all you need to do is to grab a cheap Firewire 400 card to make that work. Truth is, ANY DC-coupled audio interface will work (usually), and if you stick with the interfaces from back in the old "96 kHz is all you get" days that have that, you can make this fly for a couple hundred.