We can forget the work that these engineers do and only enjoy the results. Here are some comparisons. Note that all of these, whether originals or their improved versions, are in mp3 format demanded by the website platform.

Filtered by Lani Spahr: Wolf’s Kennst du das Land in Town Hall 1938
Original: Wolf’s Kennst du das Land in Town Hall 1938
Original: Richard Strauss’ Sie lebt hier ganz allein…Es gibt ein Reich from Ariadne auf Naxos 1928
Filtered by Lani Spahr: Richard Strauss’ Sie lebt hier ganz allein…Es gibt ein Reich from Ariadne auf Naxos 1928
Filtered by Ward Marston: Richard Strauss’ Sie lebt hier ganz allein…Es gibt ein Reich from Ariadne auf Naxos 1928
“Original” actually the audio track has been processed at a lower resolution: Schubert’s Der Wanderer (Ich komme aus Gebirge her). Note the radio “time tone”. Town Hall 1946
Filtered by Lani Spahr: Schubert’s Der Wanderer (Ich komme aus Gebirge her). Note the radio “time tone” has disappeared, but you can still hear Lehmann’s singing. Town Hall 1946
Unfiltered Abendempfindung by Mozart with Ulanowsky, probably from the Town Hall performance on 27 February 1949. This is taken from a 16″ acetate that had been transferred to a vinyl disc spinning at 33 1/3 rpm and destined for VOA or the troops.
Unfiltered Dans un bois solitaire by Mozart with Ulanowsky, probably from the Town Hall performance on 27 February 1949. This is taken from a 16″ acetate that had been transferred to a vinyl disc spinning at 33 1/3 rpm and destined for VOA or the troops.
Unfiltered Das Mädchen spricht by Brahms in a radio broadcast introduced by Lionel Barrymore, destined for VOA or the troops.
Filtered by Lani Spahr: Das Mädchen spricht by Brahms in a radio broadcast introduced by Lionel Barrymore, destined for VOA or the troops.
Unfiltered live Das Veilchen unknown origin, but probably broadcast.
Unfiltered live Du Aermste kann wohl nie ermessen from Wagner’s Lohengrin; broadcast on Magic Key
Filtered by Lani Spahr: Du Aermste kann wohl nie ermessen from Wagner’s Lohengrin; broadcast on Magic Key
Unfiltered live None but the lonely Heart by Tchaikovsky from a Magic Key broadcast of 18 September 1939.
Filtered by Lani Spahr: None but the lonely Heart by Tchaikovsky from a Magic Key broadcast of 18 September 1939.
Unfiltered live The Star by Rogers from 18 September 1939 Magic Key broadcast
Filtered by Lani Spahr: live The Star by Rogers from 18 September 1939 Magic Key broadcast
Unfiltered live Vissi d’arte in Italian with orchestra from 3 April 1938 Magic Key broadcast
Filtered by Lani Spahr: live Vissi d’arte in Italian with orchestra from 3 April 1938 Magic Key broadcast
Unfiltered live Wie froh und frisch by Brahms from 27 February 1949 Town Hall recital with Ulanowsky
Filtered by Lani Spahr: live Wie froh und frisch by Brahms from 27 February 1949 Town Hall recital with Ulanowsky
Unfiltered live Zueignung by Strauss with orchestra from 3 April 1938 Magic Key broadcast
Filtered by Lani Spahr: Zueignung by Strauss with orchestra from 3 April 1938 Magic Key broadcast