I use my IPAD with DJ2 for DJing and UnRealbook for my lead sheets. Also have the Roland APp for editing on my BK9 Trying to learn how to change registrations on the BK9 to match the leadsheet I call up.
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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