I seem to remember Kurzweil pulling a neat polyphomy trick by assigning alternate keys to seperate sound engines to double the polyphony, is that right?
I'm waiting for the next version of the Audya (or whatever it's called) since the current version lacks some features found on lower cost arrangers from the Big Three. Like USB 2.0 for one. Like paltry user memory for another.
The thread seems well and truly hijacked anyway so; The user memeory on the Audya is only for INS/MSP voices and the Audya uses streaming technology. Unlike the other manufacturers it doesn't require user ram to play MP3/Wav files or to store stuff. The reserved factory ram does not require expansion, so there is no option to do so.
Why do you need USB 2.0? (maybe another thread would be good for this one)