Note: the term 'output' has been changed from 'instrument' as of version 6.0.8
The currently assigned Output displayed in the Output column determines the MIDI channel or Audio port on which the associated track plays back (the Outputs MIDI channel and port can be configured using the Mixer (Instruments) window, or by Option-clicking on the displayed Metro Output name). Audio ports are only available on machines running Sound Manager 3.2 or higher. Assigning a tracks Output to an Audio port changes that track from a MIDI track to an Audio track. Audio tracks parallel the functionality of MIDI tracks, however, they play and record digital audio files rather than MIDI data. You can reassign the Output on a track by clicking the Output name, holding down the mouse, and choosing a new Output from the pop-up menu that opens. The Metro Outputs displayed in this menu are directly related to the Outputs you set up within the Mixer window. You can assign multiple Metro Outputs to a single track by Shift-clicking the Output name, holding down the mouse, and choosing a new Output from the pop-up menu that opens. Both Outputs will now be displayed in the tracks Output column. Shift-click and choose the Output name again to remove it from the tracks Output column.