In Wave.video, you can edit the audio file. Here are the editing options that are available:
Trim the audio file
Change its volume
Add a fade in/fade out effect
In order to access the editing options, please click on the audio file on the timeline. It will open the inspector on the right-hand side.
You can also duplicate the audio track by clicking this sign on the timeline:
If you want to delete the audio track from the timeline, simply click the "Bucket" sign.