Amongst the 8Mb of samples in Classic Keys, surprisingly few are derived directly from genuine keyboards. The complete list is as follows:
You would expect the percussion sample in an instrument called Classic Keys to be taken from TR808s, 909s, and CR78s. Unfortunately they're not — they're just basic samples of acoustic drums. What a missed opportunity! OK, I know that some players will find the drums useful for "all in a single box" sequencing, but if you want an M1, you should buy an M1.
Having had my gripe, I'll admit that Emu have made it easy to use and modify the sounds. Indeed, they have dedicated seven 'Instruments' to them, and these can be edited conventionally within any patch. They have also included seven 'reverb spaces' which, when added to the drums themselves, enable you to program reverbed/gated Phil Collins‑type kits without sending your entire multitimbral mix through the effects processors.