Adobe 22011292 User Guide - Page 127

ADOBE AUDITION 113 User Guide Pan/Expand The Pan/Expand effect is used to pan, or shift, the center channel of a stereo waveform. It also lets you expand or narrow the stereo separation of the left and right channels. Pan/Expand dialog Center Channel Panning makes use of the "surround" and "center" channels of a stereo recording, where the "surround" channel is the difference (L-R) of the two original channels, and "center" is the sum (L+R) of them. In this case, you can think of a stereo recording as having 4 channels (left, right, middle, surround), and this effect will pan these channels around. For example, you can pan hard left to get the old "center" channel coming out the left speaker, and the old "surround" channel coming out the right. This type of panning can provide realism to original stereo recordings. Expanding works by subtracting out or adding differing amounts of left and right channel signal, so things occurring on the right or left are boosted or cut. Both of these elements can be altered dynamically over time by using the respective graph. Center Channel Pan This graph represents the pan position of the center channel of a stereo waveform over time. The graph's x-axis (horizontal) represents the length of the waveform or selection, while the y-axis (vertical) represents the percentage of the pan from center. You can use the graph to position the center channel anywhere from hard left (-100%) or hard right (100%), with the corresponding surround channel moving right to left in the opposite direction. Use this for panning original stereo data more realistically than amplitude panning allows.