Each time you adjust the audio levels, a number of small blue diamonds appear (Figure 7.14).
Figure 7.14. The small blue diamonds indicate keyframes.
These diamond marks are called keyframes and are part of the magic behind the NLE system.
A keyframe does pretty much what it says on the box: It creates a key point around which certain actions occur.
With audio editing, keyframes are created every time you make an adjustment to the audio levels. In Figure 7.14, you can see that multiple changes have been made, creating multiple blue diamondskeyframesthat control the level of audio.
Once created, these keyframes can be manipulated, moved, or deleted at will, which is the true power of a keyframe. However, the Audio Editor must be open to be able to adjust audio keyframes.
Keyframes are also used extensively in Liquid Edition to control visual effects. You can find more on keyframes and their uses in Chapters 8 and 9.