Set up N-Track to use with ASIO drivers:

Start up N-Track

Select
File->Settings->Preferences->Recording Settings Tab

Choose 48000 Sampling Frequency

Click AUDIO DEVICES button->Advanced Button

Choose Show ASIO Devices only.

Currently I have selected 

Use up to 1 output channels
Use up to 4 input channels

When you record audio, N-track channel 1Left will corresond to 
KX ASIO channel 0Left, N-Track 1Right to KX ASIO 0Right and so on.

Take a look at the DSP window by right clicking on
the Mixer and choosing "KX DSP". The default DSP should work fine
for you, but it is fully customizable and when you begin to
understand it, you can make your own setup with different Plugins.
If you start messing with it and screw things up you can always right
click the DSP and choose "Reinitialize DSP" and the default DSP will
reappear. You might also need to right click on it again and choose
"Re-Align Plugins".

This is hopefully enough to make the 2 cards work with KX and N-Track.
Read the KX manual and visit the KX Website and forum often. It is
a complex setup, so give it time.

Good luck,
Doug W