Pro Tools Reference Guide
674
material equally. However, when working with
sample-based (non-Elastic) audio on tick-based
tracks, tempo changes affect the start location of
audio regions, but not their duration.
Since the length of each sample-based audio re-
gion in a track is unaffected by changes in
tempo, existing automation data is not aligned
with the audio after a tempo change is made to
a tick-based audio track.
Minimizing Automation Drift
In general, automation drift is more pro-
nounced with larger sample-based audio re-
gions. By creating many small regions, the ef-
fects of automation drift can be minimized,
because the start points of each subsequent re-
gion changes as the tempo changes. When
tempo is decreased, automation expands. When
tempo is increased, automation contracts.
Tempo Changes and Tick-Based
Elastic Audio Tracks
Regions on tick-based, Elastic Audio-enabled
tracks apply Time Compression and Expansion
(TCE) based on tempo changes. For simple
tempo changes, regions on tick-based Elastic Au-
dio-enabled tracks automatically conform to
match the new tempo. Tempo changes do not
affect sample-based, Elastic Audio-enabled
tracks. In Figure 41 below, the first two-bar re-
gion is at its native tempo of 120 bpm. The sec-
ond two-bar region has been conformed to the
tempo change of 100 bpm. Since the second re-
Tempo changes applied to (non-Elastic) audio regions
When tempo changes on a tick-based audio track...
...automation gets out of sync with audio.
Tempo at 120 bpm
No Elastic Audio
Tick-based
Tempo at 146 bpm
Tempo changes applied to small sample-based regions
on a tick-based track
To break an audio region into smaller re-
gions, use Beat Detective. For more informa-
tion, see Chapter 28, “Beat Detective.”
You can also separate regions at transients
or based on the current grid resolution. For
more information, see “Separate Com-
mands” on page 496
Using many smaller regions...
...keeps audio aligned with automation changes.
Summary of Contents for Digidesign Pro Tools 8.0
Page 1: ...Reference Guide Pro Tools 8 0 ...
Page 18: ...Pro Tools Reference Guide xviii ...
Page 19: ...1 Part I Introduction ...
Page 20: ...2 ...
Page 24: ...Pro Tools Reference Guide 6 ...
Page 40: ...Pro Tools Reference Guide 22 ...
Page 45: ...27 Part II System Configuration ...
Page 46: ...28 ...
Page 58: ...Pro Tools Reference Guide 40 ...
Page 76: ...Pro Tools Reference Guide 58 ...
Page 118: ...Pro Tools Reference Guide 100 ...
Page 127: ...109 Part III Sessions Tracks ...
Page 128: ...110 ...
Page 144: ...Pro Tools Reference Guide 126 ...
Page 170: ...Pro Tools Reference Guide 152 ...
Page 228: ...Pro Tools Reference Guide 210 ...
Page 292: ...Pro Tools Reference Guide 274 ...
Page 343: ...325 Part IV Playback and Recording ...
Page 344: ...326 ...
Page 386: ...Pro Tools Reference Guide 368 ...
Page 442: ...Pro Tools Reference Guide 424 ...
Page 443: ...425 Part V Editing ...
Page 444: ...426 ...
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Page 590: ...Pro Tools Reference Guide 572 ...
Page 591: ...573 Part VI MIDI ...
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Page 679: ...661 Part VII Arranging ...
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Page 769: ...751 Part VIII Processing ...
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Page 786: ...Pro Tools Reference Guide 768 Figure 3 Quantized audio events Warp markers in Warp view ...
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Page 843: ...825 Part IX Mixing ...
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Page 991: ...973 Part X Surround ...
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Page 1025: ...1007 Part XI Sync and Video ...
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