Logic Pro 9 Upper and Low Stretch in Project tuning?????

#1
Has anyone figured out how this "new" feature works yet?:noget:

I was attempting to make each semitone interval sound 1/19 of an octave, yet the % numbers make no sense to me from what I am hearing. Does anyone have any ideas on how this feature and the numbers shown on the sliders are supposed to work?
:redface:
 
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