More negative values in ACSS

Liam Quinn writes:
 > Can I assume with the pitch, pitch-range, stress, and richness properties 
 > that negative values are not permitted?

Negative pitch would not make sense.

pitch range specifies the variation of the speaking voice from the average
 > pitch --higher pitch range == more excited voice ie your voice
varies a lot from the base fundamental --again a negative value would make no
 > sense.

A negative value for stress might make sense in certain situations
--typically, this value specifies the level of emphasis
on stressed syllables --and its effect is added to the result of applying
other rules, so a sophisticated system might want to set stress to a negative
value in order to offset some other effect-- though I would consider this

Ditto for richness

So in summary:

negative values for pitch and pitch range are probably meaningless
they might make sense in the case of stress and richness in certain situations.
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