Reply to Audiofire 2 Setup Issue

I just got an Echo AudioFire 2 interface to use with Traktor Pro, replacing a horrible M Audio Firewire interface I had. I love how small and portable this thing is but I can't get it to work. I'm sure the problem is with me, not the device!

I am having a problem figuring out how to configure the headphone output. No matter what I try, sound still comes through my headphones regardless of whether I have the cue button on my VCI 100 pressed or not.

I have downloaded the latest drivers for Audiofire2 and Traktor Pro, and I'm running osx 10.5.

Any advice for this analog dj making a confusing transition into the digital realm would be much appreciated.

Thanks in advance.