Analogue tremolo effect pedal for electric guitar that was designed to recreate two of the most desirable vacuum tube based modulation effects found in American amplifiers of the 1960’s. Player can set them via AMPLITUDE/HARMONIC switch: AMPLITUDE mode provides the traditional swampy, tremolo sounds generated by bias modulating the power tubes in the original Supro amps. HARMONIC mode provides the psychedelic tones of Leo Fender’s amps from the early 60’s. There is an implemented Leo’s unique “harmonic tremolo” effect within the output stage of the pedal to create an “amp-like” modulation experience. The pedal features pre-amp and power amp sections, with an actual output transformer deployed to recreate the magnetic saturation and coloration of the original vacuum tube based effects found in these historic amps. Along with the standard modulation controls for speed and depth, it also features a gain circuit that allows the musician to overdrive the output stage, right where the modulation effects are created. The GAIN control sets the amount of “preamp” gain in the pedal and provides a wide range of sounds from clean to grind, with magnetic saturation occurring as the power section is pushed into overdrive. When the gain settings are higher, the overall output level of the pedal is automatically compensated in order to maintain consistent signal level. This allows the musician to use the GAIN control to alter the texture of the modulation effects without an overwhelming increase in audio output level. SPEED and DEPTH controls determine the rate and amount of modulation present in the effect. An industry-standard TRS expression pedal can be used to control the speed control to set the maximum value. The rate of modulation is indicated by the pulsing LED status indicator. The pedal has an anodized, brushed-aluminium enclosure, 9V battery or AC powered operation (battery is included), rear-mounted metal jacks and studio-friendly, noiseless true-bypass switching. Dimensions: 80 x 80 x 125 mm. Weight: 0.5 kg.