Midi to audio issues

[paolom]

Hello everyone,
I have cubase SX3, triton, firebox, sampletank.
I recently had to erase and install my HD and consequentely I had to re -install all of my software.
I have never had issues like this one but now i am baffled to what is the cause of my problem.

I have complete songs which sound come from the triton, in the past for a final mix i had to create a new audio track, solo the midi I wanted to record, engage the audio track solo it and record it. Now I can't seem to be able to do so anymore.....I can't even record the midi to an audio track by playing the triton alone. I know it has to do with settings...but i have looked everywhere and tried many different combinations of possibilities but still no audio rec. I can record audio straight from mic no problems.
Also on my audio track I can't select a midi input....all i get is right and left.
does anyone have any suggestions?
thanks
Paolom