1. Add a sound to a frame, or select a frame that already contains a sound.
2. Select Window > Properties.
3. Click the Edit button on the right side of the Property inspector.
4. Do any of the following: …
5. To hear the edited sound, click the Play button.

What is the best way to edit audio in Adobe Animate?
Animate sound editing
Add a sound to a frame or choose one that already has a sound.
Go to Window > Properties.
On the right side of the Property Inspector, click the Edit button.
Perform any of the following:
Click the Play button to hear the altered sound.