This 65 button Hayden layout fitted perfectly well on the 7" Russian concertina.
That was my thought: my Beaumont 52b is 7" across, and if physical guts inside aren't an issue I don't see any problem wtih adding the extra dozen buttons along the fringes. It's not like we need to fit reeds and steel rods in there. I know some retro-fitted concertinas use the existing action, but if Dean's gets such good reviews for response, it seems like we can skip having trad action and have all the space we need, plus plenty of storage room for a cig lighter, pack of gum, and some prophylactics.
3) If I was going to set up manufacture of Midi concertinas I would obtain a batch of "blanks" from the Chinese firm that makes them for Wim Ws Elise. and other cheaper Chinese concertinas. Just the ends with the handles and the bellows. No need for the ugly F holes, or reeds and actions which are the expensive bits. Why set up a manufacture for the non electronic bits when they might be obtained almost off the shelf ?
Hot diggity-dang! This is why you're an inventor. Sure the Chinese bellows aren't fancy, but they're reasonably functional and inexpensive, and the body likewise functional just fine. If we could wrangle a deal with Wim to get a "blank" run from his supplier, that could cut out a whole lot of grunt labour that the skilled MIDI-smith won't need to muck with. Just having $20 bellows saves us, what, a good $200+ off the finished item?
Are not all the CC instruments built on the same carcass? So it wouldn't even need to be a blank Elise, just a blank body in general (albeit maybe with the Anglo/Hayen handrest and strap to save expense)
Inventor - you can link buttons on the circutboard only if you forfeit the possibility of microtonal tuning, which is important for at least two people here - me and Matthew.
Yeah, if we're the only two I could see it not being a priority, but me personally I think we'd be missing out on some really intriguing MIDI possibilities for alt-tuning if we link buttons. Rendering an acoustic concertina into meantone, JI, etc. is a vast endeavor and not easily undone, so being able to do it with a mouse-click will be a huge advantage for the microtonal set. I'll also submit that being able to do microtonal options, or wide-but-feasible keyboard in general, might be an option which would help us sell this idea to non-concertina MIDI fans as a crossover instrument. Said folks would be less fixated on "make it 6.25" like an acoustic" and more interested in a breadth of keyboard possibilities. Plus with all the weight we're saving (and the fact that the Beaumont and Elise certainly aren't unplayable due to size) I think it'll be far less ponderous than folks reckon.
I see Eric's point, but I think a flip-switch "capo" just doesn't have the possibilities that a slightly expanded keyboard gives us. Plus, with the expanded keyboard, a click-of-the-mouse capo change gets us yet more room to play with. If being tiny is the priority, I think the Paul Everett "gadget" dual MIDI Hayden keyboard is a good compromise. But that would (in theory) be a separate DIY project or different run from a small maker, with more compactness but fewer possibilities.
Happy to be corrected, but I think this has serious crossover possibilities (in a small niche of music nerds, but all things being relative) that would help us plus up the number of orders needed to make this happen, and also get more folks interested in concertina overall. This is all quite exciting!