Ok a couple of things, my memory was off on this and yes it was symmetry and not amplitude. I've been looking at different schematics and it looks like there have been different values of pots used from 20K to 35K some straight to ground, some with a 1K between the wiper and ground.
I think I'm having such a hard time remembering the details off the top of my head is my version will have features from a few different schematics. Some only go to 100KHz, some go to 2MHz. I want 2MHz. One has a nice filtered input with reverse voltage protection. I want that. Another goes down to 0.1Hz, I'm going to add that. And another has an input function which I'm not sure exactly what it is for but the chip is capable of it, so I'm going to end up with it.
Maybe I'd better print all the schematics out and come up with my own schematic and go off of it.