Hi:
I own the PA800 and I have unlimited access to the PA1Xs from the store I worked for, the diferences are actually in favor of the PA800, keep in mind that most and even more sounds are available in the newer PA800, remember that in order to enable the PA1X to load some of the new styles, you must update the OS. Those styles where touch up to work in the 1X, also the PA800 has new tone generation, it inhereted some technology from OASYS.
In functions also has some more, USB 2.0 vs Floppy, etc.
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mdorantes