Apple Logic Pro 7 - Manual (Page 191)

Chapter 4 Audio in the Arrange Window 191
The tempo is recalculated, making the Region exactly one bar long, and fitting the
length of the Cycle perfectly. This does not change the playback tempo of the audio,
but rather, makes the song tempo conform to the audio.
Time Stretching Regions
Logic allows you to change the length of audio Regions (without changing their pitch)
directly in the Arrange window—using menu or key commands. Classic Transposition
refers to the way the audio data is processed.
When applying these functions to a Region in the Arrange, a new file—consisting of
the resulting material—will be created, leaving the original intact. Both new and old
files are accessible in the Audio window.
Adjust Region Length to Locators (via classic Transposition)
Audio > Adjust Region Length to Locators stretches or compresses selected audio
Regions to fit between the current positions of the left and right locators. The Region’s
startpoint is not changed by this function—so it doesn’t matter if the locators are not
precisely above the Region.
Adjust Region Length to Nearest Bar (via Classic Transposition)
Audio > Adjust Region Length to Nearest Bar adjusts the length of selected Regions to
the closest whole bar. This function is ideal for fitting previously trimmed drum loops
into songs where there is a small tempo discrepancy between loop and song.
Time Stretching Algorithms
Logic offers different Time Stretching and Compression algorithms in Audio > Time
Machine Algorithm. The different algorithms (see “Time and Pitch Machine” on
page 403) allow you to choose a computing method that is best suited for the musical
material.
Audio and MIDI Scrubbing
You can scrub audio and MIDI in the Arrange window simultaneously.
If your song contains Regions on more than two neighboring tracks (tracks 1, 2, 3, and
4, for example), you need only select the Regions on tracks 2 and 4, for example, to
scrub them.
Before scrubbing can occur, you need to enable File > Song Settings > MIDI > Scrubbing
with Audio in Arrange.