The "Echorus" is basically a very short echo on which optical vactrol based modulation has been applied to create a warm and organic chorus effect. It can be used as a doubler effect to expand your sound dimension when "DEPTH" and "SPEED" controls are set at minimum. For a regular gentle chorus tone, set the "D TIME" control at minimum, and the "DEPTH" around 11 o'clock. At longer delay time you'll get deeper modulation and more detuned sounds. Flip the switch to kill the dry signal and get cool and warm "vibish" tones. You can also reach special alien effects at extreme setting. See the Quickstart here. Main features are: Adjustable delay time from about 30-55ms Optical vactrol based modulation Toggle switch that kills the dry signal "DEPTH" and "SPEED" modulation adjustment Organic chorus tone Warm "vibish" sounds and out of space effects Tempo indicator (LED) Specifications: DC output w/negative center compatible w/std 9V AC adaptor 5mm LED indicator (ON/OFF) 5mm LED indicator (Tempo speed) True bypass design Controls: SPEED: Adjusts the rate of modulation DEPTH: Sets how much modulation is applied to the delayed signal D TIME: Determines the echo time (≈35ms-55ms) TOGGLE Switch: Kills the dry signal