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Audio 147
Volume and pan
The Video Preview pane can be used to study project-wide
volume and pan settings, and to help you to attain optimum
volume and pan—this is just as essential to a well-designed
movie project as hours devoted to video editing.
The pane hosts two meters which shows the entire project's
audio levels. The left and right meters represent the left and
right stereo channels, respectively, and report the audio levels
in decibels (dB).
The meter levels will increase and decrease according to the
volume level at that point in the project's playback.
The concept of the Levels meter is straightforward—the levels will peak and
dip according to currently played audio levels. You may have experienced
this on music systems while recording.
At some point, the pane may indicate that excessive volume levels are being
experienced, i.e. the levels go above 0 on any meter. This is known as digital
clipping (also known as square wave clipping). It is vital that such clipping
does not occur in your project, so you have you set the loudest part of your
audio clip to peak below 0 dB (or face audio distortion).
How do you know when clipping occurs? At the top of the example meters
opposite, you'll notice two numbers at the top of each meter. The values
represent the maximum level or "high-watermark" for each channel if
clipping occurs during the current playback. Again using the example, the
left channel has at some point during playback peaked at +2.3 dB, while the
right channel has peaked at +2.6 dB. You can leave your project to play, then
return to check for clipping—if no values appear in red then no clipping has
occurred. This saves you from having to watch the entire project's playback!
These values are always reset when playback is restarted.
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