Which, once again, is the fault of Yamaha, pure and simple. Just about everyone else including a sampler on a keyboard includes the ability to import Akai format multisamples. And there is a VAST selection of some very, very high end drum kits, brass, pianos, you name it, they got it, at reasonable prices and fairly low RAM usage. It was, until GIGA sampler, the de facto format for professional sample usage...

But Yamaha eschew it, it favor of their own tiny, unsupported (mostly) format, in an effort to monopolize sales and access (pretty anti-competitive, IMO), and of course, it's their poor owners who get shafted... Trust me, were Yamaha to include Akai support, NOBODY would be bitching about a lack of sounds. Every conceivable sound you might ever want is already out there.

And the dead Yamaha drum sound would be a thing of the past...
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An arranger is just a tool. What matters is what you build with it..!