Nice thing about standards is there’s so many to choose from… Isomorphic keyboards are very clever. You can find chromatic button accordions using similar systems but there at least a half dozen variations. Some more conducive to playing chords, some wider intervals, etc. I can’t imagine many people invested in one system willing to re-train in another, not to mention invest in an actual instrument, which of course can get pricey very fast. I’d been wanting to get my hands on one for years, but just finding one in your preferred layout can be a real task. To get a taste of what is possible, there’s a web app that offers a few different layouts on a virtual keyboard with hexagonal keys.
http://terpstrakeyboard.com/play-it-now/
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