Zuki,
Here's some of the info/research I did on the speaker options. http://www.synthzone.com/ubbs/Forum37/HTML/005980.html

As far as styles including from Korg and Ketron boards.... join the psr group for access to hundreds of styles. http://groups.yahoo.com/group/yamaha-psr-styles/

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jam on,
Terry http://imjazzed.homestead.com/Index.html