Can I modify the volume of a shot in the timeline of Premiere Pro? I have imported a mp4 clip in my Premiere Pro CS6 timeline for which I would like to turn down the volume:



However, when I try and drag the Volume effect to the clip (or any other audio effect), I see a "forbidden" sign over the cursor:



If I go through the Clip menu the Audio options are greyed out:



I tried removing the shot from the timeline and dragging the effect to the file listed in the Project window, but it didn't do anything. When I right-click on the file in the Project window, a lot of options appear, but the modifications I do there do not seem to work.

How can I just lower the volume of this shot?
When you drag a clip into a sequence, PPro will show a video track (if there is video) and audio track(s) if there is audio.  If there is both audio and video, the tracks will be linked.

The volume controls are on the audio track, not the video track.  You can adjust volume both on a clip basis and on a track basis.  Buy volume is a meaningless concept on a video track (even if the video clip is linked to an audio clip).