So let's give it a try and I apologize for any misstranslations in advance, I am not a native English speaker...
Just a first paragraph. If you like it, I will see, if I can translate some other parts.
Jürgen Ahrend about Helmut Walcha, the famous Schnitger organ at Cappel and his work as apprentice with Paul Ott there:
Regards,
Karsten