Beethoven loved especially at the time of dusk so sit down at the grand piano and to phantasize, also to often play the violin and the viola, for which purpose those two instruments had always to be placed on top of the piano. How these plays sounded, as the external sense [Beethovens ears] couldn't witness them anymore, doesn't need to be mentioned. Especially the strings, which Beethoven could no more tune himself, were a source of great auditory pain for everyone in the vicinity.
Source:
Schindler, Anton: Anton Schindler's Beethoven-Biographie: Neudruck herausgegeben von Dr. Alfred Christian Kalischer, Verlag Schuster & Löffler (1909) p.538 (available at the Internet Archive in original German)
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