Thanks for the replies...

Alain, I had tried the sine_wave, but I should have carried through and 
tried the others.  I got a nice result with the poly_wave and I think 
I'm going to keep that one.

Warp, I also tried your function and couldn't get it to show up.  After 
getting a nice result with Alain's function I'm not going to dig too 
deeply into the math trying to get that function to work, but thanks.

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