Echo, Reverb ... FX no previous on headphone

Hi,

In Rekordbox when I activate echo on channel A for exemple, if I listen the channel A with cue button the effect not work.

It is the case for Reverb, delay (maybe other effects is concerned)

Certain effects like flanger or roll for exemple work on heaphone.

It is a bug ?

Sometime  I want to try  effect in the headphone before play on master.

thanks

thanks