Greetings. A couple of thoughts here before I actually get the chance to put real hands and attention on this; please forgive me if any of this has already been addressed or answered–I’ve been enjoying looking around the forum and learning just how much is going on in this new version!
I am one of those who will be playing instruments tuned down to C2 (my home tuning is Guitar Craft standard tuning, C2-G2-D3-A3-E4-G4), and so I am keenly interested in what your general advice might be, given the intention of releasing MIDI Bass at some point with what sounds like two-note polyphony. I’m definitely looking forward to that in its own right, but I’d like to have the full polyphony of MG3 if I can get it, for my own “home base”.
[With MG2 and its lower note limit of D2, I have (somewhat) learned just to avoid the C# and C below it, but that’s imperfect, and although I haven’t really tried to tackle Guitar Craft music itself with MIDI Guitar, a lot of that repertoire leans on the expanded pitch palette the tuning gives. Maybe consider that just food for thought. (I realize that at some point you just have to decide what the lowest note possible for full polyphony is, and there’ll always be at least one of us ne’er-do-wells out here who wants it to be just one step lower… 
]
So here’s a specific question that maybe people who know MG3 (and who know MG2 better than I; I’m just a nerd, not an expert) could address:
Could I use a quality octave-up pedal (I currently run a TC Sub N Up) to shift the audio up an octave for triggering, and then a Transposer to take it back down to the actual note pitch we want? I realize that’s a hack, and that would only work for the MIDI instrument and not the parallel audio, but mechanically, how sound an idea is that for me to contemplate as a workaround?
Or, with all the drop tunings and use of baritone in recent years, is it possible that we’ll be able to see an MG3 with pitch recognition down to C2 (or B1 for baritone standard)?
Finally, I have to say: thank you for doing this. I first saw the MG3 Beta invite email the night after we left town for a weekend of kids’ tournaments, and to save space I didn’t pack a usable instrument and interface–not having any idea this is what would greet me. Aaaak! As much as I love doing the dad thing at my kids’ events (and I really do), I’m kinda bouncing in my seat for when I can get back home and put some of these ideas to the test. This expansion of controller options, chaining and wiring, and the potential promise of the new sustain behavior, is pretty exciting, even for someone new to the world of MIDI in the first place who doesn’t even entirely know what he really wants to do with it in the end.
