Well, first you have to be monitoring in stereo... ...then: There are stereo and mono tracks. If your source is stereo (i.e. a stereo softsynth like XPand or Sampletank), then you would use a stereo track. If the source is mono (i.e. vocals, guitar, bass) then you would use a mono track and use the pan controls to place audio where you wanted to hear it in the stereo field. Lots more info on the basics of recording/mixing over at .