Apple Final Cut Pro 5 - Manual (Page 916)

Chapter 7 Mixing Audio in the Timeline and Viewer 129
I
Finally, you’ll want to move the outside pair of each group of four keyframes outward a
bit, so the volume of the music doesn’t change too abruptly and startle the audience.
Less steep slopes between keyframes result in more gradual fades from one volume
level to the next.
Example: Setting Subframe Audio Level Keyframes
to Eliminate Clicks
Sometimes, when you find the perfect edit point for cutting a clip into your sequence,
you’ll notice a pop or click in the audio. This happens when you make a cut on an
awkward sample that just happens to occur at a frame boundary.
You can eliminate pops and clicks by setting keyframes for your audio levels to within
1/100th of a frame. Usually, changing an audio edit point by just a few hundredths of a
frame eliminates the clicking.
To set and adjust subframe keyframes:
1 Open the clip in the Viewer and click the Audio tab.
2 Move the playhead to the edit point that’s causing the click by pressing Shift-I or
Shift-O, or by using the Up and Down Arrow keys to move from one sequence edit
point to the next.
Adjust the slope of
the level change.