You can add sound to your animations when exporting them.
You will see this session when you choose to export your animation in the format of a video. Tap "+" to add a sound track.
Choose a sound track from your iTunes music.
You can trim the sound track and add-in fade-in/fade out effect.
In the "trim" mode, simply drag the end end of the sound track to fit in your animation.
Drag the little dot on the sound track to add the fade-in/ fade-out effect.
Before you export the video, you can choose the aspect of ratio. If you are uploading to Youtube, choose 16:9 to fit-in the Youtube player.
We also encourage you to use other movie editing apps, like Write-on Video or iMovie to add sounds in your animation. They are more video-editor base, and allow you to make more adjustment on the track.
One-tap export from Animation Desk to Write-on Video,
Add transitions to your animation clips,
Add captions and audios