To insert audio, select the audio file you want and then drag it under the clip that you want to use it on.
- You can also drag video files and put them under said clip to convert them into audio.
- Additionally, if you want to isolate the audio of a clip, right click the clip in question and then select "detach audio. If you isolate this audio, then you can adjust it either using the volume settings found in the upper right portion of the interface or drag the horizontal bar found on the audio clip (in the timeline).
- You can also adjust particular parts of the audio by holding the "option" key while clicking a point on the bar. This creates a new point, and multiple points will allow you to adjust particular parts of the audio file as you please.

Another method to adjusting audio, assuming it is for the entire clip in question and not just the audio file, is looking at the bottom of the clip at the blue bar (if you can't see it, go to "settings" on the timeline and select "show waveforms").
- You should notice a horizontal line going across, and that controls the volume. Lower it to reduce the volume, raise it to amplify the volume.
- The two points at each end are the "fade in" and "fade out," which controls how loud the volume is when the clip begins/ends.
- Be careful about deviating too far from the volume (as seen by the bars below) as this can create distortions in the audio.
- You can still establish new points with the "option" key with this method.