[vorbis] RC2 worse than RC1 and Beta4

[M.r. Rage]

 >That methodology is flawed. You will see an increase in noise in a
 >ramp at about 11kHz, following the ATH, because the ear is less
 >sensitive there. This does *not* imply a net increase in
 >spectral energy.

Fine. My example was never intended to be anything more than an 
illustration of what I'm hearing. I've been a professional audio engineer 
since 1992, so I think I have a pretty good idea about what I'm hearing.

Based on what I'm hearing in the upper sibilance range, I think there's 
another bump at around 7k. (Still using b4 128k)

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