Apple Logic Express 8 - Manual (Page 210)

210 Chapter 9 Working With Tracks
How to Freeze a Track
It’s extremely easy to freeze a track: simply activate the Freeze button—the button
that features a small ice crystal icon (white when active). Use the Track Header
configuration window to show or hide the Track Freeze buttons.
If you hold Command while clicking on a Freeze button in the track list, all tracks that
contain data in the currently-selected display level (or folder) will be frozen. If the
Freeze buttons were already enabled, they will be disabled.
You can also click-hold the Freeze button of one track, and drag the mouse up or
down. The Freeze buttons of all swiped tracks will switch to the same state.
Logic Express will create freeze files after receiving the next Play command. This allows
you to activate the Freeze buttons of multiple tracks, and render their freeze files in one
go.
You can abort freeze processes by pressing Command-Period—in this scenario, the
portion of the frozen tracks that has already been rendered will remain in the freeze
files, and will be used for playback. Frozen tracks will remain silent beyond this point.
What Happens During a Freeze
During the Freeze process, the playhead will follow 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.
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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% of available CPU power. If, for example, a track uses 40%
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% of the
CPU power, the freeze process will happen in (approximately) real time—even if offline
bouncing is used.