Clicking the Add Audio button will create a new audio track for you to place an audio file into.
You can drag and drop audio clips into the timeline like you would Scenes. Start adding to your song by dragging and dropping Clips from the Audio deck into the Audio Track.
If the Audio Clip is too long, you can left-click and drag on the end of the Clip to truncate it. This will only affect the size of the Clip on the timeline, it will not edit the size of the corresponding Clip.
Right-clicking on an Audio track in the Timeline will bring up the 'Split to New clip' option. Clicking this will separate the audio into two separate clips.
NOTE: It is not possible to use 'Split to New Clip' if all 8 clips slots are already filled
You can re-order Audio Tracks by clicking on an Audio Track and dragging it above or below other Tracks.
You can duplicate Audio Tracks by right-clicking on an Audio Track and then selecting 'Duplicate Track. Alternatively, select an Audio Track by left-clicking on it, and then press command + D/ctrl + D
To resize the Scenes and Audio Tracks column, click and hold down on the right and edge of the column and then drag to resize.