Editing : Editing Clips and Selections : Quantizing Clips to Grid

Quantizing Clips to Grid
The Quantize to Grid command adjusts the placement of selected audio and MIDI clips so that their start points (or sync points, if present) align precisely to the nearest Grid boundary.
To quantize individual MIDI notes or Elastic Audio Events, use the Quantize Event Operations. You can also use the Quantize Event Operation to quantize audio clips (see Quantize Command).
To quantize one or more clips:
1 Select the Grid value (see Defining the Grid Value).
2 With the Selector or Time Grabber tool, select the clip or clips you want to quantize. The clips can be on multiple tracks. Only clips that are entirely selected will be quantized.
3 Choose Clip > Quantize to Grid. Clip start times (or sync points) are aligned to the nearest boundaries for the defined Grid.
 
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Press Control+0 (Windows) or Command+0 (Mac) to Quantize to Grid.
For MIDI clips, only the clips are quantized and all MIDI data contained within the clips (such as notes) are moved equally, thereby retaining their rhythmic relationships.
For Elastic Audio clips, only the clips are quantized and all Elastic Audio Events contained within the clips (such as transient events) are moved equally, thereby retaining their rhythmic relationships.
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To quantize individual MIDI notes or Elastic Audio Events, use the Quantize Event Operations. You can also use the Quantize Event Operation to quantize audio clips. For more information see Quantize Command).