[samsartor]

Except for some niche Janko-layout keyboards like the WholeTone Revolution and Lumatone, isomorphic pianos haven't every really caught on. However, isomorphic layouts are very common on accordions! I have a chromatic button accordion at home and credit it with making music theory finally "click" for me. On my fiddle I can play in keys of G,D,A (and the relative minors) quite easily but struggle on weirder keys and can't handle chords at all. On the accordion it couldn't be easier!

[nathan_douglas]

I've had a few chromatic button accordions but never got gud. The layout is a delight to me... you can freeze your fingers in some position that sounds good and then just scoot it around and it sounds great anywhere. Such a cool instrument. Unfortunately, I have a fairly well-damaged right shoulder from RA and just wearing the damned things was too much for me. Maybe in another lifetime I'll learn that solo from "Cold Cold Ground." (which I think was on a diatonic, but whatever)

[analog31]

An accordionist in my locale played with an attached peg that supported the instrument from the floor.

I sympathize. I wouldn't be able to play upright bass if I had to support the instrument myself.