[vorbis] monty's branch test

[Monty]

> I tested some songs with the new code that Monty merged into the snapshot.
> It works better than the previous code ;-), but I noticed some strange
> noises made at high frequencies, even at very high bitrates : a continuous,
> high-pitched noise is added over the medium voice, and it sounds like a
> whistle. The previous code didn't do that. On the other hand, very low
> bitrates sound much better than before!

Ah, I see what's doing this I believe.

I was about to say 'but I didn't make any psychoacoustic changes!',
but I did, one I didn't intend to commit.  I'll back out the ATH
experiment that was meant for floor 1 only.

Monty

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