Soundtoys FilterFreak - Manual (Page 11)

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You can insert as many versions of FilterFreak as you’d like, just keep in mind that
each one gobbles up certain amount of CPU cycles and can make your computer start
to sweat in terms of what’s left over for other tasks.
Non-Real Time Processing (AudioSuite)
If you want to save computer power, FilterFreak can also be used to process a specific
region of audio destructively. This is done in ProTools using the AudioSuite version of
FilterFreak. To do this, first select the region of audio you’d like to process from the
Edit window of Pro Tools. Then choose FilterFreak from the AudioSuite menu of
ProTools.
Hit the process button to process the selected region with FilterFreak and to write the
result back to disk. To hear the effect before committing to disk, click on the preview
button.