Vestax VCI 400 sound problems...

Hi. New Cross DJ user here - be gentle with me
Just got a Vestax VCI 400, and can't get the sound to output properly - the lights on the main output flicker badly, and I can't get the audio to route properly (cue/master not working as they should, PFL not working at all). Wondering if it's just a case of changing the input/output routing in settings, but have tried a couple of things and they didn't seem to make any difference.
Appreciate any help anyone can give me.
Mac OSX Yosemite, Macbook Pro.
Thanks, Nigel.

Just got a Vestax VCI 400, and can't get the sound to output properly - the lights on the main output flicker badly, and I can't get the audio to route properly (cue/master not working as they should, PFL not working at all). Wondering if it's just a case of changing the input/output routing in settings, but have tried a couple of things and they didn't seem to make any difference.
Appreciate any help anyone can give me.
Mac OSX Yosemite, Macbook Pro.
Thanks, Nigel.