My MIDI hub is a MOTU midi express 128:

https://www.amazon.com/MOTU-MIDI-EXPRESS-128-Express/dp/B0002J1PNK/ref=sr_1_1_sspa?ie=UTF8&qid=1546546387&sr=8-1-spons&keywords=midi+express+128&psc=1

I drag and drop my BiaB files into my DAW, Studio One Pro 4, then assign each track to a MIDI sound. Sometimes it is a hard synth but most of the time it is a soft synth.

As far as mixing audio I strongly suggest one uses the mixer that comes with your DAW and not an external mixer. This may mean that you have to purchase an audio interface. I have a Roland OctaCapture.

Each output goes on a separate track in my DAW. Using the DAW's mixer I can add effects to any track as well as adding busses. Much more convenient than using an external mixer, at least for me. YMMV

My goal this weekend is to move just enough each day so that no one pokes me to see if I'm dead or not.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware