Editing : Editing Basics : Audio Clips and Waveforms : Guidelines for Editing Waveforms

Guidelines for Editing Waveforms
With the Selector tool in the Edit window, you can select portions of audio waveforms and divide them into segments called clips, so that you can rearrange and manipulate them in tracks.
While editing musical material, try to create clips that let you maintain a consistent beat. If you always define clips so that they contain a whole number of beats, you will be able to string the clips together and maintain a smooth, steady rhythm.
It is sometimes useful to have a steady, well-defined reference waveform (such as a drum track or click track) as a guide when selecting and defining other clips. If you have played in time with the beat, it should be easier to create rhythmically accurate clips by referring to the reference waveform.
Some important rules to keep in mind when defining clips:
*   
Whenever possible, begin a clip precisely before a volume peak, and end it immediately before another volume peak.
*   
Whenever possible, make sure a clip starts and ends on exactly the same part of a beat.
*   
Use the following Pro Tools features to help you edit rhythmic material or audio with clear transients into precise clips:
*   
*   
*