In the version of Audition that I have here, you would use the Channel Mixer effect and
use the Wider Stereo Field preset as a starting point. Stereo widening works by mixing
each channel with the opposite channel with reversed polarity. While it can sound very
seductive, don't overdo it and make sure that the end result still works in mono.
James.
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JRP Music - Audio Mastering and Restoration.
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