Figure 9.43: The keyframe assistant uses Expression Controls effects.
Twirl open 4. Both Channels to reveal the converted keyframes.
Select the 5. Shape Layer 1 layer in the Timeline. Twirl open the layer to reveal
its attributes and transform properties. Click on Add in the Timeline or Toolbar
and select the path operation Pucker & Bloat.
Twirl open 6. Pucker & Bloat 1 to reveal the Amount value. You are going to use
the keyframes created by the keyframe assistant to link the changes in audio
amplitude to this path operation??™s property.
254 Chapter 9: Shapes and Sounds
Hold down the 7. Option key (Mac) or the Alt key (Windows) and click on the
stopwatch icon next to Amount. This enables expressions to control the
property (Figure 9.44).
Figure 9.44: Enable expressions for the Amount property.
Click on the 8. spiral icon next to Expression: Amount ??” this is a Pick Whip tool.
Drag it up to the Slider property in the Both Channels layer (Figure 9.45). This
Pick Whip tool links the two properties together. Scrub through the Timeline.
Figure 9.45: Use the Pick Whip tool to link the two properties together.
The Shape Layer deforms slightly but not enough to effectively visualize the 9.
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