Delay controls the time it takes for the first echo to arrive (and the time between two consecutive echoes). The delay time is displayed in milliseconds and notes.
Lo-cut sets the frequency below which attenuation takes place (this typically happens in tape echo units).
Hi-cut sets the frequency above which attenuation takes place (this also happens in nature and in tape echo units).
TapeSim controls the amount of flutter and distortion.
Mix controls the level of the echoes that are mixed with the dry (input) signal (0% is dry only, 100% is echo only).