Volume Envelope allows total control over the volume at any part of a selected video or audio clip on the Timeline with millisecond precision. It consists of the Volume Slider, which can adjust the original volume of an audio or video clip between 0% and 100% of the original clip’s volume, and buttons to manage keyframes.
Upon opening the Volume Envelope tool for an audio or video clip for the first time, two keyframes, one at the beginning of the clip and one at the end of the clip, both set at 100% volume are visible. Using the Volume Slider will adjust the volume of the clip at the current playhead position without affecting keyframes at any other position. If no audio keyframe exists at the current playhead location, a new one will be created. If one already exists, it will be adjusted in correspondence to the value of the Volume Slider.
The following buttons are available to manage keyframes:
Add Keyframe - Add an audio keyframe at the current playhead position. This option is disabled if a keyframe is already present.
Delete Keyframe - Delete an audio keyframe from the current playhead position. This option is grayed out if there is no keyframe present.
Go to Next Keyframe - Move the current playhead position to that of the next keyframe on the Timeline.
Go to Previous Keyframe - Move the current playhead position to that of the previous keyframe on the Timeline.