Pioneer Dj OPUS-QUAD 4-Channel All-in-One DJ System (Black) - Manual (Page 119)

119
Smooth Echo
— [Number of Beats to trigger (by Crossfader)] : Sets the number of beats
before the echo is applied.
4 Press the [SMOOTH ECHO ON] button to turn on Smooth
Echo.
The button lights up when Smooth Echo is turned on.
5 Perform the trigger operation to apply the echo.
A delay sound is output several times while attenuating according to the number of beats.