Set audio file levels in Logic Pro for Mac
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 the file.
Note: You cannot use the Change Gain command on Apple Loops, surround files, or regions on tracks where Flex Pitch is turned on. If possible, adjust the Gain parameter in the region inspector, or bounce the region in place and make the edits to the resulting audio file.
Raise or lower the level of the selected audio file (or area) by a specific amount
In Logic Pro, choose Functions > Change Gain from the Audio File Editor menu bar.
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.
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.