This is normally a matter of making the right connections : We recommend the following setup :
- Footcontroller MIDI OUT to MIDI IN of your MIDI preamp.
- Connect the MIDI THRU from the preamp to the MIDI IN of the G-Major.
This way your pedal board sends the MIDI preset change commands to both the preamp and the G-Major and you can use the G-Major´s MIDI mapping function to map your G-Major's presets in the right order so the right preset/amp channel combination is selected with a touch of a button. Click here
for more info on the G-Majors MIDI mapping function.