[brandondrury]

so far i've got sound from the output lines of the card, but no sound through the computer external speakers.

So the problem is not the Delta 1010LT?

However, the click track plays through the pc speakers on playback, but no guitar sounds.

This suggests that you have the "Audition" bus set to your original soundcard. What happens if you route your master stereo bus to your original soundcard? If that works, that rules out Cubase as the problem.

I'd then switch all outputs to your Delta 1010LT and go from there. Do you have the ouputs of the Delta 1010LT ran into inputs on the Behringer mixer?

Is this version of cubase ok. or should i download a better version of cubase before i get stuck into it?

I found reliability to be a billion times better with Cubase SX3 than Cubase 5.1 VST. However, I'm not convinced this particular issue would be solved.