Question How do I use the G-Major in Stomp Box mode with my Rolls MP128p Midibuddy The G-Major doesn't respond when I turn on the learn function in the mod menu and push a button, or directly choose a cc button. but presets change works well!

Unfortunately the Rolls MIDI Buddy only supports MIDI program change commands. Because of this it only supports preset changes. The Midibuddy is not capable of sending out MIDI CC commands. Therefore it is not possible to assign buttons to the parameters decribed in the G-Majors MOD menu.