Mooer Trelicopter Optical Tremolo Micro Guitar Effects PedalThe Mooer MEP TC Trelicopter optical tremolo micro effect pedal packs an incredibly BIG sound into a very small package. The Trelicopter is a classic optical tremolo with huge range of speeds and depths. The Bias knob brings out various colours of the tremolo effect; turn it up to crack down on the signal, turn it down to loosen it. The Mooer Trelicopter emulates the classic tones of the Demeiter Tremulator. Features: Depth: Controls the depth of the