Final Cut Pro X: View audio waveforms at the audio sample level
For even more precise editing, you can zoom in to audio clips at the audio sample level. Audio samples show the audio waveform at a fraction of a second (for example, 1/48,000 for audio recorded at a sample rate of 48 kHz).
Zoom to audio samples
If the Zoom to Samples feature isn’t enabled, choose View > Zoom to Samples (or press Control-Z), so that a checkmark appears next to the menu item.
Note: The Zoom to Samples feature is enabled by default.
Zoom in until the clip shows a gray overlay indicating the borders of a video frame.
You can continue to zoom in for a closer view of the waveform.
Make edits to the clip, or make adjustments to audio effects using keyframes.
To turn off zooming to audio samples, choose View > Zoom to Samples (or press Control-Z).
Navigate by subframe
You can navigate by subframes (which are 1/80 the duration of a video frame).