it's no longer under warranty i take it? sticking keys might be as simple as something shifting and causing friction (or at least that happened to me once with a little rubber pad on some crummy casio). if you're not worried about voiding your warranty and not too put off by opening it up yourself it might not be a bad idea to check the web for diy synth repair tips. sounds like a common enough problem and may not be such a difficult fix.
― arby's, Monday, 25 October 2010 15:52 (fourteen years ago) link