Well, basically, you can do this with any arranger with a sampler... So Tyros, Ketron and the one most people do do this with, the Korg PA series. The process is a bit different, as those need to time slice the drums and trigger them with a different MIDI file as they don't time-stretch the entire loop, but it can be done.

The main thing I notice with Yamaha's drum sounds compared to Korg and Roland (who I am most familiar with) is that the drums of Roland and Korg are sampled with a hair of room sound around them. In fact, in the Korg, you can actually vary this depending on taste. I also think that they use more drums with more velocity layers on them, so the timbre itself changes as the sound gets louder. This tends to make a more dynamic sound, particularly when mated to Roland's ability to offset the velocities of selected parts depending on how strongly YOU are playing.

Yamaha, OTOH, still seem mated to that bone dry drum sound (barring the newer kits) from the 80's, and use the onboard reverb to put 'space' around the drums. Unfortunately, tight drum rooms seem the hardest reverb sound to emulate, and you STILL need a larger reverb to open certain sounds out. But if you are miking a real kit, yes, you put close mikes on all the drums. But you also have overheads, which will pick up the room a bit, AND you would have room mikes well away from the kit to pick up the room sound.

This is what I think Yamaha miss on their kits, and what adds to the liveness and realism of Roland and Korg, in particular.

The fact that Yamaha are touting that their audio loop drum parts ARE recorded with room sound included obviously shows that they consider it a plus, but until they update all their ROM kits to include it, they trail the rest, as far as I am concerned. And, as I have said elsewhere, if Yamaha made a serious attempt to update their drum KITS to be more live and dynamic, the whole need for audio loops to rescue their drum sound in styles would go away.

Fix the KITS, not add marginally useful, barely developed audio styles, Yamaha. THAT is where the problem gets fixed once and for all...