Some samples to show it's not just hot air:
http://www.sierramusiccentral.com/assorted/SampleA.mp3 (Original concert recording)
http://www.sierramusiccentral.com/assorted/SampleB.mp3 (Bias changed to center instead of left)
http://www.sierramusiccentral.com/assorted/SampleC.mp3 (A little vibrance added to the center biased version)
- Spike