Did you check the help files in N Track? You can try this.
When in live-input processing mode you should see the signal coming from your cassette player in the vu-meter and you should be able to hear it from the output of the soundcard.
If this is not happening, open the Windows volume control and make sure that the correct recording source is selected (line-in), that the signal level is correct and the same thing for the output of the soundcard.
As for the cable connections, you may connect the line out of the cassette player amplifier to the line in of the soundcard.
I once used my n-track program to convert some music from cassette to CD. I can't for the life of me remember how I did it. Can anyone help. It's a fairly long cassette I want to do now, maybe about an hour.
Appreciate any help you can give me.