DJM Tour 1 Issue - I'm Unable to Monitor Beat FX Delays Via Channel Cue

Hi Guys. I'm currently running a DJM Tour 1 & CDJ Nexus 2 setup. I'm getting a problem monitoring delay based Beat  FX via the associated Channel Cue. I can hear the other Beat FX (Trans etc.) just fine via the Cue, but I'm unable to monitor anything delay based even though I can hear it from the outputs. I have the same problem with the Sound Color FX Dub Echo. Is this correct, or am I missing something? Cheers