Audio panning is simply the swapping of audio from the left channel to the right. Like volume adjustment, you alter this using keyframes that you add to the Timeline via the Audio Editor.
To use panning
Activate Show Panning by clicking the speaker column for the track you are working with and selecting Show Track output Panning (Figure 7.44).
Figure 7.44. Showing the Panning line.
Open the Audio Editor by pressing F4 on the keyboard.
Slide the horizontal slider under the Solo button to the left or right to control panning (Figure 7.45).
Figure 7.45. The panning controls.
Sliding it in either direction adds a green keyframe to the Timeline signifying that the panning changes at this point (Figure 7.46).
Figure 7.46. An example of the panning keyframes.
Track panning is independent of the actual clips and runs the length of the Timeline, not the length of the clip. If you set a panning keyframe and then move the clip, the keyframes do not follow (Figure 7.47).
Figure 7.47. Panning keyframes are left behind when the clip is moved.
Panning keyframes are undone from the Timeline Undo button (Ctrl+Z), not the audio Undo button.
Left and Right
When panning audio streams, you need to remember that odd-numbered channels are assigned to the left speakers (A1 & A3) by default, and even numbers (A2 & A4) are assigned to the right speakers.