When a track is sample-based, the track’s automation is unaffected by changes in tempo. This means that automation is always aligned with any sample-based audio on the track with sample accuracy.

When a track is tick-based, the automation breakpoints change to match the changes in tempo.

Generally, when applying tempo changes with tick-based MIDI and Elastic Audio, this is desirable. In fact, you will probably want to set all of the tracks in your project that contain automation to tick-based. This way any tempo changes affect all tick-based track automation and track material equally. However, when working with sample-based (non-Elastic) audio on tick-based tracks, tempo changes affect the start location of audio clips, but not their duration.

Since the length of each sample-based audio clip 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.