The Earthquaker Devices Tentacle is a simple analog octave-up effect designed for players who want a raw, vintage-style upper octave without controls to get in the way. It reacts strongly to picking dynamics and works best with the guitar’s neck pickup, delivering a sharp, harmonically rich octave that cuts through mixes.

• Fixed analog octave up circuit that adds a pronounced upper harmonic for classic octave lead tones.
• Works especially well with neck pickup and higher gain settings, enhancing sustain and harmonic bloom.
• Designed as a single-function effect with no knobs, ensuring a consistent octave response every time.
• Can be placed before or after drive pedals, with placement affecting how aggressively the octave interacts with your signal.