Ian, each oscillator can have a totally different sample and totally individual ADSR, velocity and modulation source parameters to name few (not necessary to name them all here), but I think that gives you the idea..

Polyphony, as is the case as you know with ANY synth is limited to the overall poly limits on any synth, on the PA it is limited to 120. On the Motif it is 128, same as the Tyros, and all have excellent voice allocation algorithms..

But the HUGE advantage the Roland cards have, is that they actually GIVE more polyphony as they have their own dedicated dco's.

Dennis