I haven't tried yet... most of my gear is at home, and now I'm relocated for the next two months. Currently, I control the MIDJPRO via a Yamaha digital piano. My guess is that it's able to powerfeed a midi keyb through its USB connection.
But then again, we should've had it written in the user manual, right? wink
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Roland RD700 exp., Ketron Audya5, Ketron MIDJPRO, TC Helicon Harmony-M, EV N/D967, Shure Beta58A, Roland FR4X, Yamaha PSR SX900