Apple Soundtrack Pro 3 - Manual (Page 309)

Note: You can create submixes independently of the audio hardware connected to your
computer and can route audio to an output that does not correspond to a physical output.
In most situations, each submix in a project should correspond to a physical output on
the audio interface or other hardware connected to your computer. Submixes that do
not correspond to a physical output will not be heard. You may set as many submixes in
a project to the same physical output device or output channel as you like.
For more information about system output settings, see Setting the Audio Input and
Output . For more information about connecting an audio interface, see Setting the Audio
Input and Output .
For more information about working with tracks, busses, and submixes in the Timeline,
see
Tracks, Busses, Submixes, and the Master Bus and Working with Tracks, Busses, and
Submixes in the Timeline .
Example: Mixing a Project with Submixes
A classic audio post-production practice for film and video is creating separate submixes
for the dialogue, the music, and the sound effects. This provides an appropriate degree
of flexibility, both in the mixing phase and in distributing the final product.
Creating Submixes
In this example project, all tracks containing dialogue are routed to a submix called
“Dialogue.” The tracks containing sound effects are routed to a submix called “FX.” The
tracks containing music are routed to a submix called “Music.”
Dialogue tracks
Effects tracks
Music track
309 Chapter 12 Basic Mixing in Soundtrack Pro