Hopfen, Hoosier and Kramerog, Thank you muchly for the good info.
My plan is to minimash a lb. of Vienna and 4 oz. of Melanoiden and go extract for the rest of the wort.
If I'm reading your input correctly, it sounds like the Ca in the water profile is much more important that the CO3. ??
Man, I've got a lot to learn about mashing and PH. Baby steps. Good times!