Both MF and TF can be controlled from an AUX switch – this is usually foot switches set up to generate a signal when either (tip or ring) or both (tip and ring) are pressed.
These switches can be used to control a range of pedal functions and also to generate MIDI signals. They may also be set up to generate play mode signals when in preset mode and vice-versa.
You will probably want to read the User Manuals with great concentration to understand further.
