I've just gotten used to using the 2nd keyboard for years … for some songs, being able to get an additional sound "instantly" is handy. Other than that, it's just a preference; being an organ player from way back! :-)

Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys