Used Alexander Equilibrium

A simple center toggle switch on the faceplate allows you to cycle through three distinct modulation modes:

1. Tremolo (Standard/Bias): This replicates classic, volume-amplitude modulation. Think of the warm, throbbing bias-tremolo found in late-50s and 60s tube amps (like a classic black-panel Fender). It goes from a gentle, soothing pulse to a hard, choppy square-wave stammer.
2. Harmonic (The Brown-Panel Swirl): This is the crown jewel of the pedal. It emulates the legendary, complex "harmonic tremolo" found in Fender’s early-60s blonde and brown-panel amplifiers (like the Showman or Bandmaster). It works by splitting your signal into high and low-frequency bands and modulating them out of phase. The result is a chewy, phasey, almost watery swirl that sits beautifully between a uni-vibe and a traditional tremolo.
3. Vibrato (True Pitch-Shifting): This mode shifts the actual pitch of your signal up and down (frequency modulation), rather than just changing the volume. It delivers a lush, vintage pitch-warble that is perfect for lo-fi warbles, retro surf leads, or synth-like chorus textures when blended with your dry signal.