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As all the musicians appear to be tri-dactylids, with the crested individuals opting for fretless instruments, I suspect the penguoid is playing an EC.

I actually discovered this by speeding up a sarabande to a jig to shorten practice time.

I find it helpful to slow a fast tune way down to the point of accuracy. Play a jig as a waltz. Curiously, this works the other way 'round, a waltz as a jig. It seems to dislodge one's playing from the brains executive function...😊

I assume you're talking about Anglo concertinas?

I switched from years to dogs when I hit 70. Concertinas sound more promising.

And I thought I was doing pretty good with my Jeff duet. Hearing such beautiful playing makes me realize I'm still a beginner!....😃

Judging by your lovely playing that is all that's needed.

Exactly, even to the point of supplying the words to the melodies!

Concertinas are magical objects like a sorting hat. They know who you are and will invite you to play. They are playing you as you play them.

Something duetish is the pair of thumb buttons LH. My Wheatstone JD has something similar, a B, Bb pair for an instrument centered on C.

Well, it's a wish list but thinking it through, I don't see how a master button would work other than on a melody. However, if each button ( landing pad ) had multiple functions, like a little joystick. an 88 keyboard could be reduced to 52........😊

A button or other control to sharpen or flatten any note eliminating those buttons ( different than Luke's bending wheel ).

Playing for that long at a stretch, especially as a beginner, is counterproductive at least for me. Unless you're a cyborg your brain will be overwhelmed and stop processing after about 20 min. or so. Roughly 20 min. every other day is optimum for my particular lump of grey matter. With your sore arm I'd stop as soon as it starts to hurt. Combine that with Alan's suggestion to play quietly to give both your brain and body a chance to recover.

Bob Snope, formerly of the Button Box in Ma. is now in Asheville, NC. He's offering a Morse G/D in Buy and Sell here within your budget.

This is also on facebook concertina for sale about 10 rows (of 3) down. with more information but no named seller.