Apple Soundtrack Pro 3 - Manual (Page 444)

• Full Bandwidth Channels: You can select two options:
• Low-Pass Filter checkbox: Select this option to turn on a low-pass filter with a cutoff
near the available audio bandwidth that is applied to the main input channels. If the
digital signal fed to the main input channels does not contain information above the
available audio bandwidth, you can turn off this filter. Compressor automatically
determines the available bandwidth.
• DC Filter checkbox: Select this option to turn on a DC high-pass filter for all input
channels as a simple way to remove DC offsets. Most mixed audio material is already
free of DC offsets.
• Surround Channels: You can select two options:
• 90° Phase-Shift checkbox: Select this option to generate multichannel AC-3 streams
that can be downmixed in an external 2-channel decoder to create true Dolby
Surround-compatible output.
• 3 dB Attenuation checkbox: Select this option to apply a 3 dB cut to the surround
channels of a multichannel film soundtrack being transferred to a consumer home
theater format. Cinema surround channels are mixed 3 dB “hot” (higher) relative to
the front channels to account for cinema amplifier gains.
About Export Options Using Compressor
In addition to the general options for all export formats (see General Export Options ),
there are additional options when you export using Compressor.
Note: Because Soundtrack Pro can tap the power of Compressor as a background process,
many of these export options are identical to the corresponding options in the Compressor
application.
• Format to Export Video: These settings allow you to choose settings for your video
export.
• Preserve Video button: This allows you to export the video in its original format. Once
you select this option, you must then choose an export preset from the adjacent
preset pop-up menu. A summary of the preset appears below it in the dialog. When
you export, the video is copied unchanged to the exported file. For more information,
see
Using Compressor Export Presets .
444 Chapter 20 Exporting Multitrack Projects