You know, guys, there must be a couple thousand custom voices for Yamaha arranger keyboards available at absolutely no charge. Some are really good, I've made a half dozen or so, and they've been downloaded thousands of time. So, even if the onboard sound creator program wasn't there, does it really make it a deal breaker? C'mon. If the sound creator program was the only reason you would shell out more than 4-grand for a keyboard I would find better ways to spend my money. Nice feature - yep, deal breaker - not a prayer.
Good luck,
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.)