Ian, over the years I've found that all Yamaha instruments responded well to editing, but the best ones, at least from my experience, to edit were the old midi pianos - now they really can be tuned to become a fantastic sounding piano. The one I posted at PSR Tutorial has been downloaded thousands of times.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)