Apple Logic Pro 9 - Manual (Page 581)

Using the Sample Editor’s Audio Energizer
You can use the Audio Energizer to increase the perceived volume of audio material while
altering the sound as little as possible, and without causing clipping. Digital distortion,
which would be the inevitable result of simply increasing the level, is prevented when
you use this algorithm.
You could compare the effect to an analog tape that has been saturated with a high
recording level. The distortion factor and effect on the audio material is much lower than
that of analog tape saturation, however.
For example, consider that you have processed a normalized audio file (audio data which
is already at the maximum dynamic range) using the Audio Energizer, and you are playing
it back through an audio channel strip. The channel strip’s meter will show a higher level,
indicating increased average energy in the signal, but the peak level display will not
change. This demonstrates that the maximum signal level has not been altered.
Note: If the material contains anomalies such as noise, these will also be increased and
can become audible. If necessary, you can process the energized audio file with the
Silencer—make sure to use a low setting—or use the Denoiser effect plug-in.
Opening the Sample Editor’s Audio Energizer
You need to select an area within an audio file before you can open the Audio Energizer.
To open the Audio Energizer
1 Select the area of the audio region in the Sample Editor that you want to process through
the Audio Energizer.
581 Chapter 17 Editing Audio in the Sample Editor