Originally Posted by Ben B  De-interleave the stereo file so that its left and right components are on two separate tracks of PT. Duplicate these tracks twice, so that you have six tracks in total.
Take the two original L&R tracks, and pan them both center. Take the next L&R pair, and pan them both to the left. Take the third L&R pair, and pan them both to the right.
Next, use the Audiosuite "Invert" plug-in to reverse the polarity of tracks 4 and 5.
Position check:
Track 1 - Original left signal, normal polarity, panned center
Track 2 - Original right signal, normal polarity, panned center
Track 3 - Original left signal, normal polarity, panned left
Track 4 - Original right signal, inverted polarity, also panned left
Track 5 - Original left signal, inverted polarity, panned right
Track 6 - Original right signal, normal polarity, also panned right
Make a mix group out of tracks 1 and 2, called "mono sum." Make another mix group out of tracks 3-6, called "difference." At this point, you can adjust the ratio of center to sides information by manipulating your mix groups. Further bussing/subgrouping would also allow you to apply separate processing to the center and sides.
Another approach you could take is to use three stereo tracks, and a multi-mono Trim plug-in, which would allow you to phase-reverse the necessary files in real-time. I prefer the Audiosuite method, as it negates the potential problem of unequal plug-in latencies among the tracks. (This too can be avoided by using Automatic Delay Compensation in HD, or by using redundant trim plug-ins everywhere.)
-Ben B |