Question What can you do with the Nova Drive external switch connector if you are not using TC's G-Switch but, say, an amp switcher Which functions of the unit can you control through an external switch Answer You can use 2 latching relays from an external switcher using a TRS cable or a Y-Split cable. By combining these 2 relays (open or closed) you'll be able to switch between the 3 presets within a bank. (A to E) . The bank must be manually changed with the preset knob. Our recommendation is, if you have a MIDI controller, it would be easier to use MIDI.