The majority of the PSR buttons are much smaller than the PA.

The only buttons on the PSR that are bigger are the reg buttons, style play buttons and OTS.

Just like anything it will become second nature once you get used to it after a short while.

Nick
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Yamaha PSR SX900 / Roland G70 / Roland BK9 / Korg PA700 / Roland GW-8L / Roland Fantom O6