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Serif MoviePlus X6 Manual

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140 Audio
At some point, the meters 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 to 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 and right channel have at
some point during playback peaked at +7.1 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.
Assuming you've managed to prevent any clipping from occurring, you have to
then consider how the audio sounds when played on a target device (e.g. via the
web or on a created disc). You should aim to peak your audio levels at
approximately -20dB (used for professional digital audio).
The meter only gives an accurate indication of incorrectly set audio clips or
tracks—whether high or low. The prime objective is therefore to resolve
unacceptable volume levels which we'll look at next.
Adjusting volume
Volume adjustment of clips
The volume adjustment on any selected audio clip (or even video clip with audio
stream) can be made by altering Gain in the object's Properties pane (select
Adjustments>Volume). For example, the Gain can be reduced by dragging the
slider to the left (from its default 0.0 dB position).
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