Move the Stereo Expand slider to the left to narrow the image move it right to widen the image.
Click the Center Channel Extractor effect insert’s right arrow, and choose Stereo Imagery > Stereo Expander. This lets you “weight” the stereo image more toward the left or right. However, unlike the Widener you can also shift the center channel left or right. The Stereo Expander has the same goal: expand the stereo image outward to make the difference between the left and right channels more obvious and dramatic. The Stereo Expander is a standalone, and more sophisticated, version of the Widener in the Mastering effects suite. These illustrate the range of music you can create from commercially available sample and loop libraries. Sample Magic produces the Deep Tech House sample library, whereas the Continental Drift sample library is made by Sony. You’ve now learned the highlights of the Center Channel Extractor refer to Audition’s Help file for more details. Leave this file open in preparation for the next lesson. Increasing the Spectral Decay Rate will often improve sound quality as well. Choose the highest possible Crossover Bleed settings and the lowest possible Phase Discrimination, Amplitude Discrimination, and Amplitude Bandwidth settings that are consistent with sound quality and effectiveness. Click the Discrimination tab to access several real-time adjustments. Bring up the Center Channel Level to hear the vocals. Return to around 32 seconds, and start playback. The lead vocals extend to about 47 seconds, but you won’t hear them because they’re being removed (around 45 seconds you’ll hear some backup vocals that aren’t removed because they aren’t panned to center). Choose File > Open, navigate to the Lesson04 folder, and open the file ContinentalDrift.wav. Pull the Side Channel Levels control down all the way to isolate the bass. Return the Center Channel Level control to 0. Pull the Center Channel Level control down all the way, and the bass will essentially disappear. The bass will be excessively loud, and you’ll need to pull back on the Effects Rack panel’s Output control to around -7dB to avoid distortion. Start playback and slowly turn up the monitoring level. Turn down the monitoring level, and then load the preset Boost Center Channel Bass. Click an effect insert’s right arrow, and choose Stereo Imagery > Center Channel Extractor. Choose File > Open, navigate to the Lesson04 folder, and open the file DeepTechHouse.wav. However, Audition’s Center Channel Extractor is a very sophisticated implementation of this principle that allows for boosting or cutting the center channel, and also includes precise filtering to help avoid applying the effect where it’s not wanted. By filtering the channel that’s out of phase to emphasize voice frequencies, bass and kick aren’t affected that much. This is commonly used for karaoke to remove the vocal. Reversing the phase of one channel cancels out any material panned to center while leaving signals panned left and right alone. With stereo signals, some sounds are traditionally mixed to center-particularly vocals, bass, and kick drum. 
For further information on these effects, refer to the Help files. The latter is a very esoteric tool that you will likely not need to use when you’re doing typical audio projects, so we’ll cover only the Center Channel Extractor and Stereo Expander.
Audition includes three effects for altering stereo image: a Center Channel Extractor, Stereo Expander, and Graphic Phase Shifter. Stereo imagery effects alter a file’s stereo image.
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