[vorbis] frequency cutoff?

[Ross Levis]

When I tested -q4 after the RC3 release I was getting very little energy
above 17.5Khz.  It may well be a maximum of 20.5 but it must have a very
long lowpass gradient/width (I'm not sure of the scientific term).

Ross Levis.

> Hi!
> Below is Monty's mail. As he writes "lowpass is set in
> lib/modes/psych_44.h", where you can read the following:
> 
> q - kHz
> -------------
> 0 - 15.1
> 1 - 15.8
> 2 - 16.5
> 3 - 17.9
> 4 - 20.5
> 5 - 48.
> 6 - 999.
> No lowpass filter above -q6.

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