Keeley ME-8 Multi-Echo Guitar Pedal 1) ADT (Modern) Delay Time (0-50ms) Pitch Dept, 30 cents Tone Double Tracking w/Tone Control (full CCW LPF@1kHz, center notch@1kHz, full CW HPF@1kHz) 2) ADT (Vintage) Delay Time (0-30ms) Depth Rate (0.1-8Hz) Chorus like Double Tracking, Rate is the warble of a reel tape deck 3) Tape Delay Delay Time (50-950ms) Regen Tone Small amount of dynamic modulation 4) Analog Delay Delay Time (50-950ms) Regen Modulation Rate (0-10Hz) Modulation depth is dynamically controlled 5) Subdivision D The Multi-Echo features a wide range Keeley True-Chorus Double Tracker The Vintage ADT has variable Rate and Depth like an old reel-to-reel tape deck The Modern ADT features a tone control, so you can control the sound of the voices in your chorus Its like a Big Muff tone control