But Dennis, I think that, in most cases of people not liking the Korg 'sound' (or Yamaha, or anything), it boils down to a LOT more than just replacing the odd sound (which is all the RAM is big enough to do).

Plus, you have to factor in that there really isn't much OOTB in the way of samples for Korg arrangers, most of it involves a LOT of work to create a good set in the PA3. Sure, you can import samples, but you STILL have to do all the voice programming, and few arranger users are into that to the degree that you need to be to make a REALLY good sound. Even drum samples, which used to be the easiest thing to slap together, nowadays you are talking about multi-velocity cross-switches (which often import VERY strangely from Akai, for just one example) and exclusive groups (to cut one sound off with another, like hi-hats and cymbal chokes). Nothing the average arranger user is well prepared for, I expect.

Sure, if it's 'I wish it had a better oboe, then it would be perfect', the sampler is probably going to be of use. But I have a feeling that most people that say they don't like the Korg 'sound' need MUCH more than the RAM is capable of handling, even if they COULD do the work...

And yes, while Korg dole out RAM in such a manner, while Yamaha have GB's of FLASH RAM you can install, it's still 'catch-up' and trailing by a LONG margin. Korg either have to go for broke and make an end-run around Yamaha, or it's still just 'baby steps'...
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An arranger is just a tool. What matters is what you build with it..!