Is there a way for me to use some other MIDI controller, fader, or knob to control the Leslie rotary switch?
The leslie rotary control is set to receive MIDI continuous controller #1 (modulation). So any controller you choose must be set to send on MIDI CC#1.
The B4 does not allow you to change the corresponding CC values. So you must be able to do it within the hardware controller you choose to use
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