My BK7M's wheel was acting erratic. I had to take the wheel apart and clean it. Once cleaned it acted like new.
Wish I knoew how to do that. Afraid of doing damage disassembiling the unit
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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