When Show Advanced Tools is selected in the Advanced preferences pane, you can add and edit tempo changes in the Tempo track. The Tempo track is available in the Tracks area, Piano Roll Editor, Step Editor, and Score Editor.
In the Tempo track, tempo changes are represented by tempo points. You create tempo changes by adding tempo points and editing their values. You can expand the Tempo track to give yourself more room to work, and adjust the range of values for the Tempo track.
The Tempo track also determines the relationship between incoming timecode and the current playhead position, for projects using timecode.
Do one of the following:
Choose Track > Global Tracks > Show Global Tracks, or use the Show/Hide Global Tracks key command (G).
Click the Global Tracks button 
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If the Tempo track is not visible, Control-click anywhere in the global tracks header area, then select Tempo in the dialog than appears. For more information, see Show and hide global tracks.
Do one of the following:
Grab the maximum and minimum values in the tempo scale and drag vertically.
Double-click either value and enter a numerical value in the field.
