Space Designer envelope view controls in Final Cut Pro
When the Space Designer effect is set to display envelopes, the main display offers the following zoom and navigation controls (not shown in EQ view).
Overview display: Indicates which portion of the impulse response file is currently visible in the main display, helping you to orient yourself when zooming.
Zoom to Fit button: Click to display the entire impulse response waveform in the main display. Any envelope length changes are automatically reflected.
A and D buttons: Click to limit the Zoom to Fit function to the attack and decay portions of the currently selected envelope shown in the main display. The A and D buttons are available only when you are viewing the volume and filter envelopes.