I've been researching autoharps, in part because I wanted to try converting one to Diatonic, but I've learned a whole lot, including how much I DIDN'T know about the things. So a series of articles is in the works. The first one is mostly a "foundational" article describing the most popular kinds of autoharps that have been made over the years and what chord setups they used/use.
If you're wondering, say, if a 21-chorder will really give you more of the chords you need than a 15-chorder, or anything along that line, you should find this article helpful.https://creekdontrise.com/acoustic/auto ... unings.htm
We'll be following up with articles on ways to make autoharps more "folk-friendly," that is, adding chords you need for Folk, Bluegrass, Country, and Pop music by sacrificing chords you don't.
Stay tuned . . . . .