PSR-9000 / X1-owners? Danny? Jick?

I have done a little research on my first questions in the thread: I had a look through the handbook of the PSR 9000: other than the X1 there seem no live sampled drum grooves to be available (except a few short one touch settings)in the Yamaha. It only has two live drumkits onboard with some stereo (!) sampled kicks, snares, cymbals and so on. These sounds contain up to 4 samples each depending on the dynamics and how hard the keys are hit. A Yamaha tec said as far as he knows it�s the only keyboard with real stereo drum sounds (not panned).
A keyboarddealer in Germany announced the PSR had 100 newly arranged styles with live grooves recorded by real drummers.
Does that mean Midi recording? (May be thats the reason why some people believe the PSR drums grooves do not sound so lively like the ones in the X1)
Or are they just mixing it up with the groove and dynamic filters when you set up new styles from scratch?

As with the X1: You can change the tempo of the sampled drum grooves without pitch change. But if you want the same sound quality, only to a small scale, said the Yamaha tech. Okay, thats competition, but is that still true?

I still did not find in the PSR 9000 manual any possibility to alter a drum section via a drum mixer, let�s say leave away the kicks, or the snare. Is it really capable to do that ( I do not mean deleting single notes in the sequencer...)?

Any comments on that?

Best Regards

heinrich