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I happen to come up with ideas like connecting tone cable to other 4 string instrument like cello. in fact, I just tried to do it using piezo pickup and even though I can not tune my sister's cello to play ordinary guitar songs, I think this is possible if anyone make CDLC songs for the cello. if there anyone tried to do something like this, plz share your experience. I wonder that what kind of problem I will face, if i make one.