Hi..i am a new user here. As per my knowledge you should Set AltIn according to a selected pedal input. For the low impedance input AltIn must be set to No and for the high impedance input AltIn must be set to Yes.Set LevelsAuto to No.Set LowLevel to a minimum (11).Set HiLevel to a maximum (1023).Go to LowLevel and press the pedal to within 5%-10% of fully closed (almost closed). In the top row of the LCD you will read current "raw level" reading. Set LowLevel just below the current "raw level" reading.