See the reference manual section below:
https://s1manual.presonus.com/Content/Editing_Topics/Timestretching.htm
Automatic Timestretching
Automatic timestretching is based on the relationship between the Song tempo and the audio file’s tempo.
Each Audio Track has a Tempo mode that controls the behavior of the Events on the Track, based on the Song tempo. The Tempo mode can be selected in the Track Inspector. The following modes are available:
- Don’t Follow Events on this Track are independent of the Song tempo. They are never moved or stretched automatically.
- Follow The start positions of Events on this Track are tied to the musical grid. Thus, the Events move when the Song tempo changes but they are not stretched.
- Timestretch Event start positions follow the Song tempo, as in Follow mode. In addition, the Events are stretched to fit the Song tempo.
Audio File Tempo Information
For automatic timestretching to work as described, Studio One needs to know the original tempo of an audio file. The software can then calculate how to stretch the file to fit the Song tempo. Many audio loops have this information encoded.
