In 1960, Leo Fender introduced a circuit in his Bandmaster and Vibrasonic amplifiers that he called "harmonic tremolo" (although this was later found to be a misnomer, as it turned out to be a volume effect, not a pitch effect). By splitting the amp signal into high and low frequencies and switching the output, you can achieve dreamy effects like Uni-Vibe. The 3 SeriesHarmonic Tremolo puts Leo Fender's revolutionary effect into a package that's much more portable than a vintage amplifier. The toggle switch in the up position gives you a great sounding amp tremolo (a tremolo that increases or decreases the signal), while the toggle switch in the down position gives you a harmonic tremolo effect. Specifications Input/Output Terminals: Input, Output Controls: VOLUME, RATE, DEPTH (HARMONIC TREM) Switch: TYPE (HARMONIC TREM) / UP/DOWN (OCTAVE REVERB) Power supply: DC9V center negative
![JHS Pedals HARMONIC TREM [3 Series] (JHS Pedal/3 Series) Tremolo](https://cdn.shopify.com/s/files/1/0638/4173/0673/files/HARMONIC_TREM__3_Series___JHS_Pedal_3_Series__Tremolo_01.jpg?v=1760097624&width=480)
