German 78 rpm record.
Deutsche Grammophon, recording 1928, Berlin, Germany.
Claudia Arrau.

95111 / B27246T / 949/951bm

-transferred from the original 78 rpm records at 78 rpm with a standard USB turntable (DJ Tech Vinyl USB 10 with Audio Technica AT-91 system) equipped with special needle ATN-78 (65 µm, spherical). Turntable speed adjusted to correct pitch.
-analog RIAA compensation and equalisation with Behringer FBQ800: 63 Hz/-1 dB, 125 Hz/+1 dB, 250 Hz/+2 dB, 500 Hz/-3 dB, 1 kHz/0 dB, 2 kHz/+3 dB, 4 kHz/+7 dB, 8 kHz/+8 dB, 16 kHz/-7 dB
-digital mono conversion
-declicking/decrackling with ClickRepair (Wavelet, 100%, 100%, all)
-Audacity:
-48 db high pass filter below 20 Hz
-digital pitch correction, if needed
-normalisation to 0 dB
-Reaper EQ:
-Type Low Shelf, Freq. 147 Hz, Gain 1.9 dB, Bandwidth 0.01 oct
-Type Band, Freq. 3998 Hz, Gain 1.2 dB, Bandwidth 2.6 oct
-Type Band, Freq. 12543 Hz, Gain 10.3 dB, Bandwidth 2.0 oct
-Type High Pass, Freq. 20286 Hz, Gain 0 dB, Bandwidth 2.0 oct
-Audacity:
-normalisation to 0 dB
Spatial enhancement (for unprocessed mono, please listen to left channel only):
-prepare 3 copies of the monaural track (1, 2, 3)
-1, 2, 3: normalise to -4 dB
-2: switch to left channel
-3: switch to right channel, add 10 ms silence to the beginning
-2,3 join as stereo track
-mix 1 (-9 dB) with (2,3) (+2 dB)
-adjust balance
-normalise result to 0 dB