Apple Logic Pro 7 - Manual (Page 375)

Chapter 9 Audio Window 375
Multiple Editing Using Strip Silence
Strip Silence always affects the selected Region in the Audio window. It doesn’t matter if
a Region was defined manually, or whether it is a product of a previously executed Strip
Silence function.
As an example, you can use this method to roughly split up a whole audio file, and
then divide the new Regions, using different parameters. The new Regions can then be
processed again with the Strip Silence function—and so on.
Reassigning Audio Regions Using Strip Silence
Regions which already exist as Audio Regions in the Arrange window can also be split
with the Strip Silence function. The position of the audio data along the sequencer time
axis is not affected. This means that a recorded Audio Region can be immediately
edited using Strip Silence. Several new Audio Regions are then created, which can be
individually moved, copied, or deleted.
Automatic Positioning of the Anchors
When you create new Regions with Strip Silence, a separate Anchor is automatically
created for each new Region. Logic always sets this to musical units, in accordance with
the format value set in the Transport window. This means that when you’re moving
Audio Regions to fit in with the music, there will be “rounded” values in the help tag.
Uses for Strip Silence
Noise Gate
The most conventional use for Strip Silence is simulation of the classic noise gate effect.
When used on long recordings with numerous gaps—such as vocals or instrumental
solos—you can obtain better results by setting a low threshold value. Background
noise is removed, without affecting the main signal.
Creating Segments of Spoken Recordings
With spoken passages, Strip Silence can divide a recording into sentences, words, or
syllables. For film synchronization or jingles, you can move or reposition the speech
segments by simply dragging them around in the Arrange window.
Tempo changes allow you to simulate a time compression/expansion effect, as the
syllables automatically move closer together, or further apart.
Creating Segments for Drum Loops
Dividing drum loops into small segments is a good way of perfectly synchronizing
them. As an example, in audio passages where the bass drum and snare are completely
separate, you can often use Strip Silence to isolate each individual beat. The new
Regions then behave much like MIDI events, with tempo changes “quantizing” them.