You can use the Selection and Pen tools to edit keyframes in the Timeline panel. You increase or decrease values by dragging keyframes vertically. When working with keyframes graphically in the 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.