I think, if you polled most PSR950/750 owners, they would MUCH rather have had say a half a dozen killer new drumkits like the 'Real Drumset' that George is talking about than 25 audio loop styles, of which they are likely to only use two or three.

Yamaha even already have the kits... You can find them in the Motif series, or in their electronic drum products. Why they are not being put into the arrangers I have no idea. How many decades will Yamaha's continue to be criticized for lackluster drumkits?

I can't honestly think I ONCE read a post asking Yamaha for a Ketron SD1-like audio drum loop ability. But I have been reading about the poor Yamaha kits for years...

Where do Yamaha do their market research? It sure ain't here, obviously, no matter how many times Steve Demming comes here!
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An arranger is just a tool. What matters is what you build with it..!