Apple Logic Pro 9 - Manual (Page 249)

Understanding the Freeze Process
During the Freeze process, the playhead follows the currently rendered position. A floating
progress bar window is also displayed.
Freeze files are always rendered between the project start and end marks. It is
recommended that you check the project end mark in the Bar ruler before starting a
Freeze process.
Tip: You should adjust the end mark of the project to include feedback-dependent delay
repetitions or reverb tails. Empty areas (digital zero) at the end of freeze files are
automatically removed after the Freeze process.
The Freeze process uses 100 percent of available CPU power. If, for example, a track uses
40 percent of the CPU for real-time plug-in calculations, its freeze file will be created
two-and-a-half times faster than the real-time playback speed. If the original track uses
100 percent of the CPU power, the Freeze process will happen in (approximately) real
time, even if offline bouncing is used.
Working with Frozen Tracks
Once a track is frozen:
• It is not possible to cut and rearrange freeze files in any way, nor is it possible to mix
the freeze files with their originals on a single track—you can use one or the other, not
both.
• It is not possible to record audio on frozen tracks. In fact, the Record Enable button is
hidden when a track is frozen.
• You cannot edit any instrument or plug-in parameters (or related automation data).
You can edit the following parameters of frozen tracks:
• Effect send levels and destinations
• Panorama and surround parameters
• Volume, mute, and solo
You can also edit the automation data for these parameters.
Whenever you try to edit forbidden parameters of frozen tracks, (such as plug-in
parameters that were rendered into the freeze file), Logic Pro asks if you want to unfreeze
the track.
To unfreeze and edit a track
µ
Click Unfreeze to deactivate the Freeze button of the track.
The freeze file is deleted.
Note: The track now uses the amount of CPU-processing power that it originally required,
if you click Play.
249 Chapter 9 Working with Tracks