When you use keyframes to animate the Opacity effect, you can view and edit the keyframes in either the Effect Controls or the Timeline panel. Sometimes, the Timeline panel alternative can be more appropriate for quickly viewing and adjusting keyframes. The following guidelines may indicate the appropriate panel for the task at hand:

• Editing keyframes in the Timeline panel works best for effects that have a single, one‑dimensional value, such as opacity or audio volume. The Effect Controls panel is usually easier for editing keyframes of properties that have multiple, angular, or two‑dimensional values, such as Levels, Rotation, or Scale, respectively.

• In the Timeline panel, variations in keyframe values are indicated graphically, so you can see at a glance how keyframe values change over time. By default, values change between keyframes in a linear manner, but you can apply options that refine the rate of change between keyframes. For example, you can bring motion to a gradual stop. You can also change the interpolation method and use Bezier controls to fine‑tune the speed and smoothness of an effect’s animation.

• The Effect Controls panel can display the keyframes of multiple properties at once, but only for the clip selected in the Timeline panel. The Timeline panel can display the keyframes for multiple tracks or clips at once but can display the keyframes of only one property per track or clip.

• Like the Timeline panel, the Effect Controls panel also displays keyframes graphically. Once keyframing is activated for an effect property, you can display the Value and Velocity graphs. The Value graph displays keyframes with changes in an effect’s property values. The Velocity graph displays keyframes with handles for adjusting the speed and smoothness of the value changes from keyframe to keyframe.

• Keyframes for audio track effects can be edited only in the Timeline panel or in the Audio Mixer. Keyframes for audio clip effects are like keyframes for video clip effects; they can be edited in the Timeline panel or in the Effect Controls panel.

You can modify the panel arrangement further and choose Window > Workspace > New Workspace to save the modified configuration as your own workspace. Be sure to give your workspace a name in the New Workspace dialog box before clicking the Save button.