mmmm. lets see.
Take those 7 drum tracks, bounce them to a stereo mix. Keep the original 7 tracks in the session just turn thier voices off. 2 tracks for drums, 6 tracks for gtr's, bass, and vocals. Wait - maybe a stereo mix of the drums less the kic and snare. 4 tracks of drums, gtr's, bass, vocals - sounds like a pretty good demo set up for free.
Why is it that everyone on this site seems to hate digidesign and protools?