Yes, I agree I did listen to the other demos, I found most of them pretty good. You are right there were a couple that sounded a little....hmmm, not "quite there" but on the whole pretty good.
Mind you I quite like the Yammies as well

Tweaking audio is a cinch to get a more lively drum sound on the Yammie, its just some, and only some, of the drum SAMPLES that Yammie are using seem to be the same as what was on the T1 and T2, not to mention the PSR3000 which I also had for a while, and so sound a bit dated...The newer samples are fine.
Dennis