Arranging : Time, Tempo, Meter, Key, and Chords : Tempo : Tempo Changes and Tick-Based Elastic Audio Tracks

Tempo Changes and Tick-Based Elastic Audio Tracks
Clips on tick-based, Elastic Audio-enabled tracks apply Time Compression and Expansion (TCE) based on tempo changes. For simple tempo changes, clips on tick-based Elastic Audio-enabled tracks automatically conform to match the new tempo. Tempo changes do not affect sample-based, Elastic Audio-enabled tracks.
In the following figure, the first two-bar clip is at its native tempo of 120 bpm. The second two-bar clip has been conformed to the tempo change of 100 bpm. Since the second clip has been warped to remain two bars long at the slower tempo, it displays the Clip Warp indicator in the upper right-hand corner of the clip.
 
For tempo curves, such as an accelerando or ritardando, Tempo Event Warp markers are automatically created corresponding to each tempo event, and the clip conforms accordingly. The following figure shows a clip in Warp view. Notice how the audio conforms to the tempo curve.
 
Tempo Event-generated Warp markers cannot be edited. They only show where the audio has been warped in order to conform to tempo changes.
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If you change the track timebase from ticks to samples, any Tempo Event–generated Warp markers convert to regular, editable Warp markers.