U cannot load drum kits or sounds from other keybaords on the PSR's.

it will technically load a voice or drum kit and it will have the correct name of that voice , but the keyboard will only trigger an existing sound or kit from that same category..

example in the guitar category, if u load in the sample "Live Classical Guitar" from the PSR 3000 into the PSR 1500. it will come up and load, but when u play it, it will only sound like the normal nylon on the PSR 1500.. as in, it triggers the closect voice to it that the PSR 1500 already has on board...

hope this is clear enough

Cheers, Nick