The Tempo map is the collection of tempos and beats set for the sequence. It has only meaning for midi input and output tracks.A tempo map can be empty, in which case the default tempo is set to 120 and the default beat value is set to 4/4.
To edit the tempos, open the tempo dialog:
This dialog by rightclicking allows you to:
All midi tracks are reloaded to comply with the new tempo values. The linker is also updated.
You can also edit the tempo using an automation curve. Select the "Tempo Curves" icon from the track manager and edit the tempo in place. Note that tempo changes also change the absolute time signatures.
Tempo maps can also be loaded from Scripts .