You can create chroma keys directly on the timeline using the Axis Keyer. When you enter the Axis Keyer, the clip loaded as the Front is the clip with the Axis soft effect, and the clip loaded as the Back is the next available layer on the timeline.

To access the Axis Keyer:

1. Build a multilayer timeline with a front layer and a background.
2. Select the layer you want to key, and click Axis.
3. Double-click the element or click E beside the soft effect button.
4. In the Object menu, click Keyer.

   
   

   The Axis Keyer appears.

   The Front clip is provided by the clip with the Axis soft effect.

   
   

   Image courtesy of Behavior Communications Inc.

5. Create the key. See Keyer.

   The Back is provided from the next available clip in the multilayer timeline.

   
   

   Image courtesy of Behavior Communications Inc.