At the beginning of the manual it references a stomp box setup but then nowhere in the manual does it say how to do it. I would like to be able to turn each effect on or off with a foot controller without using presets. Can this be done and how? Thanks.
The "stompbox" setup refers to the direct control to effects on/off within a single preset.
You can do that if you have a MIDI board that can transmit a latching MIDI CC from its switches. Since the G-Major / G-Major 2 has 8 effect blocks, tap and some other controllable features, you will need a pedal board with at least 10 switches.
In the MOD Menu of the G-Major / G-Major 2 you can assign each effect block ON/OFF to a switch (MIDI CC).