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Roland MPU-105 midi output selector unbound

The Roland MPU-105 is a compact 5x midi switch selector that runs off a 9V dc power supply. I thought it would be worthwhile putting a battery pack inside so it can moved around the studio and be free of yet another ‘wall wart’ DC power supply. A purchased a 8x AA battery holder, which with 1.5v (usually produce 1.3v) NiMH rechargeable batteries would nominally provide around…