Apple Soundtrack Pro 2 - Manual (Page 270)

270 Chapter 8 Basic Mixing in Soundtrack Pro
Using Sends and Busses
You can use sends to split an audio signal into two or more separate signals. A send taps
a track’s audio signal and routes it down a separate but parallel path. In Soundtrack Pro,
these separate paths are known as busses. (Some might call these auxiliary busses.) This
process is analogous to diverting a portion of a river to an alternate (but parallel) stream.
Busses are like alternate streams of audio. They can be processed or combined
independently of the “main river.” They can rejoin the main signal further “downstream,”
at the final mix, or they can be routed to altogether separate outputs.
By preparing these alternate versions and combinations of track audio signals, you give
yourself more options at the final mix stage, when all of your project’s media elements
and adjustments are in place.
Example: Adding Effects with Sends and Busses
The following example shows how you could add a reverb effect to a music track using
a bus. The main reason to apply effects this way (rather than directly on the track) is so
you can control the amount and characteristics of the effect (in this case, reverb) on
multiple tracks using one set of controls.
To accomplish this, you do the following:
 Create a new bus. (In this example, the new bus is named “MusicReverb.”)
 Add a send to the music track.
 Route the new send to the MusicReverb bus.
 Apply a reverb effect to the MusicReverb bus.
For specific information about how to add sends to tracks and route them to busses,
see “
Adding Sends to Tracks ” on page 349.
Send
Track
Submix bus
Bus
1
Audio clip
Effects
Volume fader
Send
Track
Submix bus
MusicReverb bus
Music
Audio clip
Effects
Volume fader
Reverb effect