V1897. PAUL KNÜPFER, Vol. III: Songs by August Pabst, Adriaen Valerius & Leo Blech; Arias, Duets & Ensembles (w.Hermann Jadlowker, Barbara Kemp & Waldemar Henke) from Nozze, La Muette de Portici, Zar und Zimmermann, Die Lustige Weiber von Windsor, Alessandro Stradella, Fra Diavolo, Prodaná Nevesta, Undine, Der Freischütz, Martha, Der Fliegende Holländer, Tristan & Les Huguenots. (Germany) Truesound Transfers 3094, recorded 1914-15. Transfers by Christian Zwarg.
"Paul Knüpfer spent most of his career at the Berlin Imperial Opera where he was a noted buffo bass. He sang Baron Ochs in the Berlin premiere of Der Rosenkavalier. He often performed with his wife, soprano Maria Knüpfer-Egli."
- Ned Ludd
“[Truesound] transfers have been an absolute revelation to me….Amazingly, Christian Zwarg has managed to unlock the sound of these recordings in such a way as to present [voices] such as I have never heard before. Here the sound has a sheen and glow which is quite beautiful. It is as if an old masterpiece painting has been cleaned and restored, allowing rays of brilliant light to emerge….”
- Davyd Booth, THE RECORD COLLECTOR, 2012