1. Once you add dialog to your characters click the position of the phrase lines where you want to add an audio playback. Click the Audio button on the left hand side menu and you’d see an audio icon is added.
2. Click the audio icon on the phrase line to activate audio settings. Under Effect Settings click CHOOSE FILE FROM SOURCE to upload an audio or music file. You can also click and drag sliders below the Volume and Pitch to adjust them and if you want to play this audio/music in a loop click the checkbox beside Make it a looping sound.