Set the FCB1010 in MIDI MERGE MODE
You want the MIDI OUT from the Roland RD-700GX to feed the MIDI IN of the FCB1010.
You want the merged output from the FCB1010 to feed the Korg Pa2X Pro.
Open the GLOBAL CONFIGURATION – CONFIG page:
Make sure the LEDs on Pedal 8 and 9 are ON.
Pedal 8 = Red LED ON = MIDI MERGE Enabled
Pedal 9 = Red LED ON = Running Status Enabled
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Using a Behringer FCB1010 with a Korg Pa2X