Exporting a master mix to a compressed audio file, S see, Exporting a master – Apple Soundtrack Pro 2 User Manual
Page 399: Mix to a compressed audio file, Exporting to mp3 files
Chapter 16
Exporting Multitrack Projects
399
5
Choose a bit depth for the exported file from the Bit Depth pop-up menu.
6
Choose a sample rate for the exported file from the Sample Rate pop-up menu.
The sample rate is the number of times an analog signal is measured—or sampled—
per second. The higher the sample rate, the higher the quality and the larger the file
size, but don’t choose a sample rate higher than the rate used in your multitrack
project or you’ll waste space.
7
You can optionally use the After Export pop-up menu to choose a post-export action.
For information about post-export actions, see “
8
Type a name for the exported file, and browse to the location where you want to
save the file.
9
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 a Master Mix to a Compressed Audio File
You can export a mixdown of your project to any of the following compressed audio
formats: MP3, AAC/Podcast, and Dolby Digital Professional (AC-3). These compressed
formats provide reduced file sizes and data rate reduction.
Exporting to 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.