premiere pro cs6

Audio tracks, either those associated with your video or tracks that are just audio, are displayed below the video tracks toward the bottom of your Timeline.

If you want to stop the audio from playing on a particular audio track you can turn off the audio in the Timeline by selecting the speaker icon button to the far left.

You also can adjust the overall audio level for a track or for an individual clip.

First click on the tiny disclosure triangle just to the left of the name of the audio track (such as Audio 1) to expand the track.

If the waveform is not present, you may need to click the small waveform icon to make sure it's set to display the waveform.

A waveform is a visual representation of the audio that shows when the audio peaks -  along with a yellow horizontal line through the waveform that represents the audio level. You'll also see several buttons to the left that you can use to adjust the audio.

To make more room to work, you can also pull open the track manually with your cursor, by placing the cursor exactly between two tracks and dragging the above track open. You can also press the tilde key ( ~ ) on the keyboard to show the timeline in fullscreen mode.

Adjusting Volume for an Entire Track

To adjust the volume for the entire track, on the left click on the tiny diamond Show button and select Show Track Volume.

Then click on the yellow audio level line and drag it up or down to change the audio level for the entire track. 

Adjusting Volume for an Individual Clip

To change the volume for an individual clip, on the left click on the tiny diamond Show button and select Show Clip Volume.

Then click on the yellow audio level line on a clip and drag it up or down to change the audio level for that clip.

Adjusting Volume at Multiple Points in a Clip

You also can raise or lower the audio at multiple points in a clip to create fade ins and fade outs in your audio. To do this you need to add keyframes to the audio level line for a clip.

First on the left click on the tiny diamond Show button and select Show Clip Keyframes.

You create keyframes by holding down the Command key on the Mac keyboard and then clicking on the yellow audio level line at the points where you want the audio to change (you also can select the Pen tool in the tool palette to add keyframes).

When you then move your mouse cursor back over a keyframe you'll notice a little diamond icon appear to the lower right of the cursor arrow. This indicates you can change the audio level at this point by clicking, holding down your mouse button and dragging the keyframe point higher to increase the audio or lower to decrease the audio.

The yellow audio level line will change accordingly. If the audio level line slopes up from one keyframe to the next, the audio will fade in. If the audio level line slopes down from one keyframe to the next, the audio will fade out.

You also can move a keyframe to the left or right to change the point for the change in audio volume by clicking on the keyframe with the cursor and dragging it.

To delete a keyframe, right click on it and select Delete.