Traktor & Edirol, misc problems Options

[Topher]

Hello there,

I own an Edirol UA-25 and I would just like to hook up my Traktor DJ Studio 2.5 to it to get the sound out on the speakers while cueing tracks with my headphones on my laptop's line out. That should be possible, right ?
My Traktor does see the Edirol that I can select for "master out" but for the "monitor" section, it says "not connected" and I have no option.

Also, the Edirol sometimes (and even quite often) fades out the sound and comes back a few seconds later - sometimes with some glitchy noises for a split second. Since it's brand new, it may be something I'm doing wrong. Buffer ? Latency ? USB ? RAM ?

Thanks for your help.