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The Supro Tremolo has been configured to emulate two iconic vacuum tube-based modulation effects you can find in 60s American amps. It carries an Amplitude/Harmonic switch that lets you select between the two vintage effects. The Harmonic mode gives you the psychedelic tones of Leo Fender’s vintage blonde and brownface amps, while Amplitude serves up the old-school swampy, tremolo sounds produced by bias modulating the original Supro amps’ power tubes. The Supro Tremolo also consists of Speed, Gain, and Depth knobs.