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Change the gain of audio regions in the Tracks area in Logic Pro for Mac
You can edit the gain of audio regions in the Tracks area using the Gain tool. When the Gain tool is selected, placing the pointer over an audio region in the Tracks area shows the gain in decibels (dB), and as a yellow line across the region. You can click and hold the region, and drag up or down to increase or decrease the gain. When the Audio Track Editor is open, you can see the gain change visually reflected in the waveform.
If you make a marquee selection in the audio region, and then use the Gain tool, the change applies only to the selection, not the entire region.