Apple Final Cut Express 4 - Manual (Page 673)

Chapter 44 Using Audio Filters 673
VIII
Installing Third-Party Audio Units Filters
If you install third-party Audio Units filters, they will be available to all applications on
your computer that are capable of using them, including Final Cut Express. You only
need to install them in one location.
Before purchasing third-party Audio Units filters for use with Final Cut Express, check with
the third-party manufacturer to make sure the filters are compatible. Currently,
Final Cut Express works only with Audio Units filters that are capable of accepting mono
audio as input and can output a mono signal. Also, Audio Units filters that don’t support
certain properties required by Final Cut Express for real-time playback may require
rendering before playback.
For information on how to install third-party audio filters, see the information that
came with the filters.
Important: If you open a project that uses a filter that is not installed on your
computer, Final Cut Express warns you that the filter is missing. If you install the filter
and open Final Cut Express, the warning goes away. Clips that have missing filters
applied still play back in the Timeline, but the effects are missing.