Hi, mknight:
This question comes up so often, it should be referenced somewhere . . . hell, maybe it is ?
What you need to do is solo your MIDI tracks and record this to one or more audio tracks.
If your sound card won't allow you to do this internally, then simply get everything set to play the MIDI and record audio, then connect your (speakers out) to ( Line in ).Let your tune run and you dupe the MIDI to audio.
Hope this helps.
Regards,
PAPicker