Scott I know exactly what u are talking about.

the DAC's (Digital to Analogue Converters) on the PA 500 are not the same as the PA 800 and PA 2X.

there is a HUGE write up about this on the korg forums.
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Roland G70 / Roland BK9 / Roland GW8-L / Yamaha Motif XS / Technics KN6500