Volume Control and Tone Control Note: This pedal uses a passive Tone control circuit and works best when connected directly to a passive guitar. If you must use an active guitar or put other pedal before this one, the output impedance of the active device should be 10kOhm minimum for the best performance. - Tuner Output: Connect to your tuner, if desired. The Volume Control does NOT affect this output, but the Tone Control DOES affect it. - Input jack: Plug your guitar (or other audio source) in here. - Output jack: Connect to the input of your amplifier (or other audio device).