Jon, I m no expert, but for the cost of the DKC 850, you might want to check out what the QRS PNOmation system can do for you. Inexpensive options are
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RE: [disklavier] Disklavier problem - upgrade or fix?
2014-06-28 by uecker.juneau@juno.com
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2014-06-28 by uecker.juneau@juno.com