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Amplitude modulation, otherwise known as tremolo, is arguably the first 'overt' guitar effect. Amplifiers with built-in tremolo began appearing by the late 40's, and became standard equipment by the late 50's. The first major style of music to adopt tremolo as it's own was surf music - groups like the Del-Tones, the Ventures and the Chantays combined tremolo with reverb to create the definitive surf guitar sound.
In 1961, the Fender Electric Instrument Manufacturing Company released a complex variation on the tremolo effect known commonly as harmonic vibrato. While not technically vibrato (frequency modulation), this new take on tremolo created an effect vaguely reminiscent of a rotating speaker. Due to it's complexity and cost, this form of tremolo was short lived, and no adequate substitute existed - until now.
ToadWorks USA is proud to announce the release of the world's first stereo Tremolo / Harmonic Vibrato pedal, PipeLine.
The key to the harmonic vibrato is a combination of high and low-pass filters applied to alternating (out of phase) modulated signals. The result is something that cannot be adequately described, it must be heard to be fully appreciated.