Apple Soundtrack Pro 3 - Manual (Page 447)

For more information, see Using Export Presets .
3 Choose Master Mix from the Exported Items pop-up menu.
4 Use the File Type pop-up menu to choose a file type for the exported audio file.
If you choose any of the last four menu items (MP3 File, AAC/Podcast File, Dolby Digital
Professional (AC-3) File, or Using Compressor), the central section of the Export dialog
displays options for the selected format type. For information about these menu items,
see
Exporting a Master Mix .
5 To export a separate mono audio file for each output channel in your multitrack project,
select the “Create multiple mono files” checkbox.
For more information, see About Exporting Multiple Mono Files .
6 Choose a bit depth for the exported file from the Bit Depth pop-up menu.
7 Choose a sample rate for the exported file from the Sample Rate pop-up menu.
8 If you like, use the After Export pop-up menu to choose a post-export action.
For more information, see Using Post-Export Actions .
9 Enter a name for the exported file, then navigate to the location where you want to save
the file.
10 Click Export.
Note: When you bounce or export a project with an effect tail (sound that extends past
the end of the audio file, usually caused by reverb or another effect), the length of the
tail is limited to a maximum of 30 seconds. If the tail extends beyond this amount of time,
it is cut off after 30 seconds in the bounced or exported file.
Exporting as MP3 Files
MP3 is a specific type of MPEG encoding known formally as MPEG audio layer 3. MP3 uses
perceptual audio coding and psychoacoustic compression to remove all superfluous
information (specifically the redundant and irrelevant parts of a sound signal that the
human ear doesn’t hear anyway). The result is that MP3 encoding shrinks the original
sound data from a CD (with a data rate of 1411.2 kilobits per one second of stereo music)
by a factor of 12 (down to 112–128kbps) without sacrificing very much sound quality.
Proponents of MP3 claim there is no sacrifice in sound quality, but audio professionals
can usually hear the difference on good equipment.
To export a master mix as an MP3 file
1 Choose File > Export (or press Command-E).
The Export dialog appears.
2 If you want, choose an export preset from the Preset pop-up menu.
For more information, see Using Export Presets .
3 Choose Master Mix from the Exported Items pop-up menu.
447 Chapter 20 Exporting Multitrack Projects