Gain on multiple tracks?
 

I have PTLE 7.1 on a Mac Powerbook G4, 10.4.8. I am using Reason 3 rewired through PT and need to know how to change the gain for multiple MIDI instruments. It works fine if I only have one MIDI track, but currently there are two tracks in a song where one needs much more and one needs much less. How do I select which track gets what level of gain?