Echo has six modes: Digital (change the time without pitching), Tape (wow, flutter, saturation, hiss), Analog (BBD — every repeat darker), Ping-Pong, Reverse and Dual with separate L and R times. Time in ms or synced to tempo (dotted and triplet), feedback above 100% for runaway effects, filters and drive in the loop, and ducking so the echoes don't drown the vocal.