Editing keyframe values in a Timeline panel

You can use the Selection and Pen tools to edit keyframes in a Timeline panel. You increase or decrease values by dragging keyframes vertically. When working with keyframes graphically in a Timeline panel, be aware of how the values and units of specific properties are represented along the vertical axis of the time graph, as in the following examples:

Opacity is measured from 0% at the bottom of the scale to 100% at the top of the scale, and the center of the graph is 50%.
Rotation is measured in rotations and degrees, and the center of the graph represents no rotation (0°). Clockwise rotation values are above the center, and counterclockwise values are below the center.
Audio balance is measured from –100 to 100, with 0 at the center (neutral balance). Dragging above the center moves balance toward the left channel and sets a negative value, and dragging below the center moves balance toward the right channel and sets a positive value.