having the Registration up/down buttons is a massive advantage for quick on the fly method of switching between your reg banks! great feature!
i could only imagine the PSR (or any board) distorting our sounding un clear at higher volume levels would be possibly because the eq is too low.
i think your eq settings may need a touch of Gary Diamond and the board will really come alive!
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Yamaha PSR SX900 / Roland G70 / Roland BK9 / Korg PA700 / Roland GW-8L / Roland Fantom O6