Reply to need help with typhoon + maya44 usb sound card

hey guys i have a vestax typhoon controller and i am trying to use a esi maya44 usb sounds card but im having problems. i cant get the right settings so i can hear what i trying to mix in my headphones whilst the current song is playing in traktor. ive tried every combo i can as to the output routing but still having no luck. when using the sound device built into the typhoon, as soon as i alter anything on the controller traktor slows and gets grainy. im believeing of simply buying a audio 2dj sound card as i know they work but im struggling to see why i cant get this set up working.
any help much appreciated