Hi Jarlath,

just to make it clear : If you play a "standard" midi-file you Žll always hear only the GM-sounds. Yamaha-keys have the possibility of "auto-revoicing", they can automatically change a few "standard instruments" to Mega- / SA-voices.

If you want to hear the "better" ( built in ) sounds youŽll have to know "only" the appropriate banks / midi-commands ( if keyboard permitts this )
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Greetings from East-Frisia ( Northern-Germany )