How Linked Mono and Stereo Clips Are Normalized
The Apply Normalization Gain command works differently depending on the type of
clip items selected:
 Single mono clip item or multiple linked mono clip items: A separate Gain filter is
applied to each clip item, and peaks for each clip item are calculated independently.
 Stereo clip items: A stereo Gain filter is applied to the stereo clip items, and the Gain
setting is based on the peak value across both channels.