Change the gain of audio regions in Logic Pro for Mac - Apple Support

You can change the gain of audio regions with the Gain tool, or in the region or cell inspector.

Select parts of regions in Logic Pro for Mac - Apple Support

Common parameters in the Logic Pro for Mac Environment - Apple Support (KG)

How to gain stage on Logic Pro X

General View settings in Logic Pro for Mac - Apple Support

Create tracks in a Logic Pro for Mac project - Apple Support

Apply plug-in effects to audio regions in Logic Pro for Mac - Apple Support (PH)

Export regions as audio files in Logic Pro for Mac - Apple Support

Overview of the Logic Pro for Mac Audio File Editor interface - Apple Support

Audio Editing settings in Logic Pro for Mac - Apple Support