Audio Gain and Keyframes in FCP7

FCP 7 new feature is the ability to use the audio gain adjustments on one audio keyframe.

I can't get this option to work. Here's the excerpt from the user manual:

"Note: When adjusting a keyframe with the Gain Adjust commands, you can position the playhead on a keyframe to change its level, or position the playhead between two keyframes to change the audio level of the segment between the keyframes. When using the Pen tool to add keyframes, you can create highly accurate keyframes located between frame boundaries."

This doesn't work for me: whenever I use a gain adjust command, all the keyframes in that clip move up and down, with no regard for the location marker's position.

Also, the range selection should let you adjust only keyframes within the range, but this doesn't seem to work for me either.

"To select a range of keyframes to modify
Use the Range Selection tool to select a group of keyframes. You can now move, delete, or change the level of just those keyframes."

Anyone figured out the trick for this new feature?