Using Audio Filters

Audio filters are used for a variety of purposes, from audio cleanup to special effects. Filter parameters can be copied, pasted, automated, and adjusted in real time.

The goal of audio mixing and processing is to create a believable sonic environment that is not distracting. Audio filters can help to remove distracting frequencies, reduce loud sounds, and add ambience to a sonic space. Generally, filters are much better at removing components of a mix than they are at adding something that wasn’t in the original recording. An audio engineer with a thorough understanding of how sound works and how filters affect sound can produce excellent results with just a few equalizer and compression filters.

Final Cut Pro includes a set of audio filters that you can use for equalization, compression and expansion, adding reverb, vocal cleanup, and noise removal. Final Cut Pro uses the Mac OS X Audio Units plug-in format.

Audio filter parameters can be adjusted in real time so you can make changes to a filter’s settings while the clip plays back. When keyframe recording is turned on in the Audio Mixer, Final Cut Pro records all changes you make to audio filter parameters as keyframes; those keyframes appear in the parameter’s keyframe graph in that clip’s Filters tab in the Viewer.