The Mission EP1-TC is an expression and volume pedal specifically designed for the TC Electronic G-System. Up to four EP1-TC pedals can be connected to one G-System. Use one pedal for global volume and a second for expression. Maybe add a third as a dedicated wah or whammy pedal. There are numerous configuration options for the G-System. The EP1-TC circuit is designed to carefully match the requirements for the G-System for easy calibration and a full sweep pedal response.