I am currently researching the Voltz line and have Anna Magdalena's information including the marriage record between her and Valentin Schaefer. I have several films I'm working my way through at our local Family History Center, so I don't know how much info I can provide, but I'm guessing a number of the birth records of their children and certainly Anna Magdalena's parents' information. Please contact me at firstname.lastname@example.org
and I will send scanned copies of everything I have. It may take some time since I haven't gotten through all the films, but I know I have information on the Voltz side. If you're only interested in names and dates, I can send the information in a pedigree chart or family group sheet. Otherwise, I can provide the images of the actual records (along with the translations). Please let me know. Hope the information will help you!!