Once you've added a sound to your content, you have a few simple sound editing options at your disposal:

Shift your sound in time: music, voice or sounds usually need to be synchronized with your visual content, so you will have to shift these objects in time to accomplish that. You can either shift the sound object within the Clip or move the Clip as a whole. Some users also put all audio objects in one single audio clip that spans the whole length of the video. 

Modify the volume level of your sound: To do that, first select the sound in the Timeline (its background turns blue when selected). On the right side of the stage, you will see the audio properties. Click on Playback tab and adjust the volume slider left or right.

Show the waveform of your object: When you add an object that contains audio the waveform icon will be visible in the Timeline: 

After splitting your sound, you can either delete a part or move it in time. You can also change the length of the parts: just drag their edges left or right to hear more or less of the audio:

Cut a piece out of an audio object: Position the Playhead where you want to split the sound. Right-click the sound layer in the Timeline and select “Split layer” in the right-click menu. Delete the part that needs to be removed:

Add a Fade In or Fade Out effect to your sound: To do that, first select your sound and click the "Add Effect" button at the bottom of the Timeline:

You can adjust the length of the Fade effect by dragging the small border bullets to the left or the right:

Finally, you can also loop your sounds: when you drag the right edge of a sound to the right, beyond the length of the available audio, it will repeat the sound from the beginning. Fine vertical lines in the soundbar show where the loop repeats. You can also go to the Add effect function, add the loop, and indicate how many times the audio should loop.

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