Hi,
when cueing the signal is only sent to the headphone "prefader", this means it will come through your soundsystem as well if the channelfader isn´t closed.
So: channelfader down/closed ->hit cue-> you will only hear it in the headphones.
If it still comes out your soundsystem or you don´t hear anything your audio-routing is wrong.
regards
J
Edit: wtf is wrong with my spelling today
