Jim, many years ago I posted a Yamaha Piano voice that I created using the PSR-3000. It took me about a week to get what I wanted to hear, but nevertheless, it really worked well and has been downloaded thousands of times. If I recall, I used one of the Gm Piano voices, then went to work using the effects.
I'll be more than happy to post the link if anyone wishes to download it.
Gary
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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.)