If you have used volume automation on a track already you and want to lower everything by e.g. 3 dB here’s what you can do:
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open up the Volume automation lane of the track
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right-click on the lane in the track list, select “Select All Events”
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use the marked handle to scale all automation vertically; look at the Info Line before moving the handle, take note of the intial value of the displayed point; move the handle down so that the value becomes 3dB less than before.