Procedural animation Help
 

Hi everyone,
My name is Nick and I'm a student at CCAD. I'm working on a rig that I would like to incorporate procedural animation into. I have scoured the forums (and internet) for information on this but haven't found much :(

Using this expression

I wanted to generate oscillating numbers that would drive gill movements. This is the same idea as procedurally generated bird wing movements. However I have run into a problem when adjusting the Frequency controls. As it slides up or down the oscillation races faster and then slows down when the frequency control stops moving. Obviously the desired result is a smooth transition between compressed and drawn out frequencies.
A Maya 7 file I've been using to explore this problem can be found here

this is what my graph look like also:
http://www.indigames.com/graph.jpg

I appreciate your help.