andre,
i have alot of styles on the memory card, also the internal memory is quite busy, less than 2 mb. did not noticed any problems in working with the instrument. i have an e60.
for converting the styles, you could use style works, the new version does also the g70/e50 conversions.
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.