Electro-Harmonix Nano Big Muff Pi Distortion Pedal User Guide

Quick guide from the manual

The Nano Big Muff Pi is a compact harmonic distortion-sustain pedal designed for electric guitar. It features True Bypass switching, meaning the signal passes directly from input to output when the effect is disengaged. The pedal can be powered by a 9V battery or an external AC adapter.

Controls

• Sustain Control: Adjusts the amount of sustain and distortion applied to the signal.
• Tone Control: Provides a range of sounds from high treble to deep bass. Turning the knob clockwise increases treble and decreases bass.
• Volume Control: Sets the overall output level of the pedal.
• Footswitch & Status LED: The footswitch toggles between effect and bypass modes. When the LED is lit, the effect is active. When the LED is off, the pedal is in True Bypass mode.

Connections

• INPUT Jack: 1/4 inch jack for the audio input from your instrument. The input impedance is 130 kΩ.
• AMP Jack: 1/4 inch jack for the audio output to your amplifier. In Bypass mode, this jack is connected directly to the INPUT jack.

Power supply

The pedal is powered by a 9V battery or an optional 9VDC AC Adapter. If using an AC adapter, it must be capable of delivering at least 25mA and have a center-negative plug (e.g., EHX9.6DC-200). The battery can remain inside the unit while using an AC adapter.

Changing the battery

To replace the 9-volt battery, follow these steps:

1. Remove the 4 screws located on the bottom of the pedal.
2. Take off the bottom plate.
3. Replace the battery.
4. Reattach the bottom plate and screws.

Warning: Do not touch the circuit board while the bottom plate is removed to avoid damaging components.

Warranty and support

Electro-Harmonix offers a one-year warranty from the date of purchase for original purchasers from authorized retailers. Registration is recommended via the official website. For service, contact EHX Customer Service in the USA/Canada or the appropriate regional office for Europe. Customers outside listed regions should contact EHX Customer Service via email at [email protected] or by phone at +1-718-937-8300.