okay, so the dataline cut mod works differently on this guy.
I get a diverse set of tricks, depending on the patch(es) - from data scrambling to detuning to octave up/down and high end cutoff. Personally, I think the dx100 sounds more wild, but that might just be my taste. BUT, on a DX, let me say that a few treatments at the flick of a switch is pretty welcomed...and on the DX21 without having an assignable slider, its a blessing.
At one point it all went japanesey on me, but I just had to do a manual reset and reassign the sound banks and midi channels and she pepped back up.