Key Stroke for increasing and decresasing speed on the fly

?Does anyone of you know of a key stroke that increases and decreases the speed 
of jaws on the fly? I know that pressing page up and page down (I think) while 
using a read-all command jaws speaks faster and slower respectivily. But I want 
a keystroke that increase and decrease speed at any time. If any could help me 
I will be greatly thankful.


Yadiel

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