Apple Logic Pro 8 - Manual (Page 869)

Chapter 39 Working in the Environment 869
As an example, the output of an Arrange track (the note events in a MIDI region)
routed to (software) instrument channel 1 can be arpeggiated. To do this, you would
create an arpeggiator object (this will be easiest on the Mixer layer of the Environment),
assign the arpeggiator to the Arrange track (Control-click the track header to access the
Track Assignment menu, and browse to the arpeggiator object), then cable the
arpeggiator out to instrument channel 1.
On playback, the note events in the region will be processed by the arpeggiator object,
and routed (via the cable) into the instrument channel, which plays back the processed
(arpeggiated) MIDI note data.
Creating Direct Output Assignments
You can create a direct output connection to a physical MIDI output from any of the
following object types:
 Instrument
 Multi Instrument
 Mapped Instrument
 Touch Tracks
 GM Mixer
 MIDI Metronome Click