Glad you found the issue!
I've installed a couple of those boards and I add quick disconnects (or connects as the case may be) and a set of instructions that allows the user or a tech to quickly remove the board for debugging.
I think Kenton should do something similar, especially given the very expensive midi board they sell for what it is, but they do leave it up to the customer.?
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Argh... please disregard my last message. Your were onto it - the midi board was the source of a bunch of those issues.
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I received the Kenton install instructions and now I know that traces and wires were cut to do the install which caused some crazy behaviour when the kit was removed.
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A major fault does remain - the Keyboard control brilliance and level controls are causing a pitch input. I can dial in a fairly reasonable pitch and play the CS80 close to normally but outside that 'sweet spot' range is a load of dissonant shreaking that eventually goes out of hearing range as the paddles are at maximum.
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Thanks for your help, Scott. I was mulling it over all day and the coin finally dropped to have a closer look at the midi install.