I do the same thing on my Roladn DP FP90 and just enjoy the fabulous piano sound. Sometimes I add a layer to it but alone it just pulls you in to play more, and dare I say thru its onboard speakers. Spent a lot of time with it alone and wish for that magical place where I could do just that and sing a bit.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer