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Read the review: If there’s such thing as a cult modulation effect, the “harmonic tremolo” found in certain early-1960s Fender brownface amps certainly qualifies. Unlike most trems, which modulate the entire frequency of your signal, the circuit splits your sound into high and low bands, modulating one with an LFO, and the other with an inverted version of the LFO, alternately emphasizing treble and bass. The result isn’t pure tremolo, but a trippy trem/vibrato/phaser hy
