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Hello ryktnk, nice to have you here! Since you mentioned (electromusic-thread) that those switches are not easily to come by I'd think it fine to offer PCB, pic and switches as a package. At least I'd be interested in such a bundle. Depending on the price.
But it will work just as well with the rotary type switch, which
is also easier to mount onto a panel.
Yes it runs on +/- 15v, but also will work fine [i think] on +/-12v
but the CV range will be different to the 3v/5v range, so some
small adjustment to a couple of resistors if this is important.