The Supro 1310 Tremolo pedal is a one stop shop for anyone looking for the tremolo sounds of a classic '60s guitar amp. This analog pedal offers two distinct modes of tremolo, each offering its own distinct flavor of vintage warble. The Amplitude mode simulates that "swampy" tremolo created by the modulation of power tubes in old Supro amps. The Harmonic model is a bit more Fender-esque in texture, harkening back to the designs of Leo Fender in the early '60s.