Arranging : Time, Tempo, Meter, Key, and Chords : Editing Tempo Events in the Tempo Editor : Selecting Tempo Edit Density

Selecting Tempo Edit Density
The Tempo Editor lets you specify the density of tempo events created in the Tempo ruler when you draw a tempo curve with the Pencil tool.
 
To select the Tempo Edit Density for Pencil tool edits:
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Click the Tempo Edit Density selector and select a time value from the pop-up menu. Tempo events created by drawing with the Pencil tool are placed in the Tempo ruler at the specified density.
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Pressing Start (Windows) or Control (Mac) before drawing a pencil line conforms already created tempo events to the drawn line rather than creating new tempo events.