10.6

Table Of Contents
507Logic Pro User Guide
Trim or silence audio files in Logic Pro
You use the Trim function to edit areas of the audio file that are not selected. It’s useful for
removing unimportant passages—generally silence—from the start and end of your audio
files. Trim can also be used to remove portions of audio files that are not used by regions.
You can use the Silence command to set all amplitude values to 0, rather than removing
(with Cut, Delete, or Trim) all data from the selected area of an audio file. This function is
generally used to silence unwanted background noise in quiet passages.
Trim all unselected portions of an audio file
In Logic Pro, choose Functions > Trim from the Audio File Editor menu bar (or
pressControl-T).
Important: Make sure the areas you are about to trim (delete) do not contain any regions
that you may need. Regions outside the selected area are lost. Portions of regions that fall
partly outside the selected area are also removed, resulting in a length reduction of the
region. If any such regions are being used in the main window, a warning dialog gives you
the option of canceling the Trim operation.
Silence the selected area of an audio file
In Logic Pro, choose Functions > Silence from the Audio File Editor menu bar (or press
Control-Delete).
Set audio file levels in Logic Pro
You can use the Change Gain command to change the level of an audio file in the Audio
File Editor. Typically used on an entire audio file, this command can also be used to boost
portions of it.
Raise or lower the level of the selected audio file (or area) by a specific amount
1. In Logic Pro, choose Functions > Change Gain from the Audio File Editor menu bar.
2. Choose your settings in the Change Gain dialog:
Set the required level change in the Change Relative fields by clicking the up or down
arrows, or by directly entering values, in either field. You can use the percentage or
decibel field to indicate the amount of increase or decrease you prefer.
Click the Search Maximum button to search for the peak level. This automatically
sets a value that is used to alter the level of the audio file. The Results in Absolute
fields display the maximum level that is achieved by changing the gain—by the
amount shown in the Change Relative fields.
3. Click Change to perform the gain change.
Important: You should never make a gain change that results in a value over 100%,
because this results in digital clipping.