George, that flash rom isn't for the internal voices. That 4mb can be used for loading in user samples. The previous models had 2mb flash, and the newer models now have 4mbs. Meaning you can have basically (2) good size wav tones instead of (1) as on the earlier models. QuietDIN is right. This issue was cleared up some time ago on the Piano WK forum. Also it was easy to confuse too because the sites had it written to where it looked like 32MB (they didn't write MBits).
Squeak
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.