go to this link and scroll down
http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail/0,,CNTID%25253D544448%252526CTID%25253D206400%252526ATRID%25253D20%252526DETYP%25253DATTRIBUTE,00.html
doesnt look like it has any slots for plugin boards...
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Yamaha PSR SX900 / Roland G70 / Roland BK9 / Korg PA700 / Roland GW-8L / Roland Fantom O6