To create one or more instrument tracks, choose Project menu> Add Track> Instrument Track> Add Instruments
A dialog appears that allows you to choose an instrument, and the number of instances of that instrument you wish to add.
You can also choose the number of MIDI tracks to be created and assigned to the chosen instrument. If you create multiple MIDI tracks and the instrument you choose has multiple MIDI destinations (such as the 16 individual parts in MachFive), Digital Performer will map each MIDI track to a separate channel.
Couldn’t be easier.