Apart from an amplifier, nothing gives guitar players a greater degree of control over tonality than an equalizer. Boutique pedalmaker MXR has decades of EQ know-how, and it shows in its M109 Six Band Graphic EQ. Guitarists can really stretch their tone with this pedal, whether it’s low-end warmth or higher-frequency boost. LEDs allow guitarists to see the levels in both dark concert venues and direct sunlight.