Need help! Trying to use TechTV guide

I seen the article from tech tv about using modemspy and a recording control from radioshack so I went and bought one and everything works except I can't figure out how to get it so that the person I'm calling can hear the soundboards. You are supposed to be able to plug the 1/8 plug into the output of your soundcard but I've tried every plug in on my sound card and I still get nothing. I might have the configuration options wrong but I have no idea. Can anyone point me in the right direction, a guide maybe, or help explain it a little better, thanks in advance.

 

OK, i haven't actually tried it myself yet but i would think that you need to plug that into the Headphone socket of your sound card. let us know how it goes.