Apple Logic Express 7 - Manual (Page 289)

Chapter 11 Sample Editor 289
If you click on Search Maximum, the highest peak level is determined, and a value is
then calculated for use when normalizing the audio file.
results in absolute: displays the maximum level that will be achieved by changing the
gain (by the amount shown in the Change relative: box).
You should never make a gain change that results in a value over 100%, as this will
result in digital clipping.
Click Change (or press Return) to perform the gain change.
Fade In/Out
Fade In
Functions > Fade In creates a fade in. You can set up the fade-in time period directly in
the currently selected audio. Volume is set to zero at the left start point of the selection,
and the fade-in occurs over the length of the selection.
Fade Out
Functions > Fade Out works in the same way as fade in, except that the fade works in
the opposite direction. This lets you fade passages out automatically. This function is
destructive.
If you use the Silence (see “Silence” on page 289) function to remove unwanted
background noise from silent passages, small jumps in volume can sometimes appear
at the start and end points of selections, as well as on the edges of the audio signal. In
this situation, zoom in, and select a small area surrounding (just before and after) the
startpoint of the signal, then use the fade-in function.
Silence
You can use Functions > Silence to remove all data from a selected area. The waveform
material contained in the selected audio passage and the corresponding amplitude
values are all set to zero. You can use this function to silence unwanted background
noise in quiet passages.
Invert/Reverse
Invert
Functions > Invert completely reverses the phase of all currently-selected audio material.
All negative amplitude values become positive, and vice versa. While this doesn’t
audibly change the file, if heard in isolation, you can use Invert to correct phase
cancellation errors, particularly if you’re mixing down to mono. This is extremely useful
when several out of tune signals (or several signals processed through chorus effects),
are to be mixed down to mono. The process depends heavily on the audio material.
You can also use the Invert function to decode MS recordings, but it’s far easier to use
the DirMixer plug-in for this task.