I too am descended from Magdalena and Herman.The information I have on Herman is as follows:
His father was Herman or Christian Snyder b. 1722 d. 8/3/1811.He is buried at the Graybill Cemetary (Crossroads Cemetary), West Perry Township, Snyder County, PA.I have no information on his wife or wives.
I show that he had 8 children: Casper, Sebilla, Christopher, Thomas, Mary Magdalene (married Jacob Graybill), Agnes, Sarah, and our Herman.
I have many different sources for Herman, one book source for Mary Magdalene and Herman/Christian Sr. but the information on Herman's siblings was from the LDS website which can be wrong.So, take the information but use it carefully :)
I am descended from Herman and Magdalena's daughter Hannah Snyder who married Joseph Shellenberger.