- Tone City Tremble Tremolo, effects pedal, inspired by the legendary built-in tremolo units from vintage F-style amps, classic character and authentic, warm tone, wide range of possible sounds from gentle warble to choppy staccato-style pulses, true bypass, controls for Volume, Depth, Speed, bypass footswitch, transparent knob with status LED, metal housing, 6.3 mm mono in / output jacks, power supply via optional 9V DC adapter, 2.1 x 5.5 mm barrel plug, polarity (-) center, battery operation not supported, current draw 3 mA, dimensions (L x W x H) 94 x 45 x 48 mm / 3.70" x 1.77" x 1.89", weight ca. 262 g / 0.58 lbs