Apple Final Cut Pro 6 - Manual (Page 947)

162 Part I Audio Mixing
Working with Audio Filters
Filters can be added to any audio clip in a project. You can add filters individually or in
groups. When you add filters to a clip, they appear in the Filters tab of the Viewer when
that clip is opened in the Viewer. How they appear depends on whether the audio clip
in the Viewer is a stereo pair:
 If the audio clip in the Viewer is a stereo pair: Every filter you add is applied to both
channels equally, and only one set of controls appears.
 If the audio clip in the Viewer is not a stereo pair: Every filter you add is applied to both
channels, but each channel can have individual settings.