The effect sound of this DJM applied to the channel selected by the effect channel switch at [SEND/RETURN] is not outputted to RETURN AUX channel. Why?

The following effect sounds of this DJM applied to the channel selected by the effect channel switch at [SEND/RETURN] are not outputted to the RETURN AUX channel due to the specification.

SOUND COLOR FX

DUB ECHO

 

BEAT FX

DELAY, ECHO, PING PONG, SPIRAL, REVERB, TRANS, FLANGER, PITCH

 

Please refer here