It seems like source to this in not in foobar, but from libebur128-0.1.10-win32 (or perhaps in me?), although it's author posted different results in early stage: link
libebur128-0.1.10-win32
for %x in (*.wav) do r128-sndfile.exe -r -t "%x"
global
loudness: LRA:
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1kHz Sine -20 LUFS-16bit.wav -19.95 LUFS 0.00 1.95382238 0.10073853 1.95382238 0.10073853
1kHz Sine -26 LUFS-16bit.wav -25.95 LUFS 0.00 7.95382395 0.05050659 7.95382395 0.05050659
1kHz Sine -40 LUFS-16bit.wav -39.99 LUFS 0.00 21.99266006 0.01025391 21.99266006 0.01025391
seq-3341-1-16bit.wav -22.95 LUFS 0.00 4.95355644 0.07131958 4.95355644 0.07131958
seq-3341-2-16bit.wav -32.96 LUFS 0.00 14.95986040 0.02304077 14.95986040 0.02304077
seq-3341-3-16bit.wav -23.00 LUFS 17.04 4.99589982 0.07147217 4.99589982 0.07147217
seq-3341-4-16bit.wav -23.04 LUFS 16.99 5.03591862 0.07080078 5.03591862 0.07080078
seq-3341-5-16bit.wav -22.95 LUFS 6.00 4.94999745 0.10083008 4.94999745 0.10083008
seq-3341-6-5channels-16bit.wav -23.02 LUFS 0.00 5.01715778 0.06307983 5.01715778 0.06307983
seq-3341-6-6channels-WAVEEX-16bit.wav -23.02 LUFS 0.00 5.01715778 0.06307983 5.01715778 0.06307983
seq-3341-7_seq-3342-5-24bit.wav -22.98 LUFS 5.07 4.98024250 0.35833156 4.98024250 0.35833156
seq-3341-8_seq-3342-6-24bit.wav -23.01 LUFS 2.24 5.00907772 0.71829414 5.00907772 0.71829414
seq-3342-1-16bit.wav -22.59 LUFS 10.00 4.58967232 0.10000610 4.58967232 0.10000610
seq-3342-2-16bit.wav -16.81 LUFS 5.00 -1.18933078 0.17782593 -1.18933078 0.17782593
seq-3342-3-16bit.wav -20.01 LUFS 20.00 2.01475665 0.10000610 2.01475665 0.10000610
seq-3342-4-16bit.wav -20.04 LUFS 15.00 2.03504371 0.10000610 2.03504371 0.10000610
r128gain
r128gain --r128 --true-peak=on *.wav
SoX successfully loaded.
FFmpeg successfully loaded.
analyzing ...
1kHz Sine -20 LUFS-16bit.wav (1/16): -20.0 LUFS, -3.0 LU (peak: 0.100733: -10.0 dBFS)
1kHz Sine -26 LUFS-16bit.wav (2/16): -26.0 LUFS, 3.0 LU (peak: 0.050508: -13.0 dBFS)
1kHz Sine -40 LUFS-16bit.wav (3/16): -40.0 LUFS, 17.0 LU (peak: 0.010260: -19.9 dBFS)
seq-3341-1-16bit.wav (4/16): -23.0 LUFS, -0.0 LU (peak: 0.071316: -11.5 dBFS)
seq-3341-2-16bit.wav (5/16): -33.0 LUFS, 10.0 LU (peak: 0.023049: -16.4 dBFS)
seq-3341-3-16bit.wav (6/16): -23.0 LUFS, -0.0 LU (peak: 0.071468: -11.5 dBFS)
seq-3341-4-16bit.wav (7/16): -23.0 LUFS, 0.0 LU (peak: 0.070849: -11.5 dBFS)
seq-3341-5-16bit.wav (8/16): -22.9 LUFS, -0.1 LU (peak: 0.100845: -10.0 dBFS)
seq-3341-6-5channels-16bit.wav (9/16): -23.0 LUFS, 0.0 LU (peak: 0.063132: -12.0 dBFS)
seq-3341-6-6channels-WAVEEX-16bit.wav (10/16): -23.7 LUFS, 0.7 LU (peak: 0.063132: -12.0 dBFS)
seq-3341-7_seq-3342-5-24bit.wav (11/16): -23.0 LUFS, -0.0 LU (peak: 0.358340: -4.5 dBFS)
seq-3341-8_seq-3342-6-24bit.wav (12/16): -23.0 LUFS, 0.0 LU (peak: 0.718297: -1.4 dBFS)
seq-3342-1-16bit.wav (13/16): -22.6 LUFS, -0.4 LU (peak: 0.100088: -10.0 dBFS)
seq-3342-2-16bit.wav (14/16): -16.8 LUFS, -6.2 LU (peak: 0.177971: -7.5 dBFS)
seq-3342-3-16bit.wav (15/16): -20.0 LUFS, -3.0 LU (peak: 0.100088: -10.0 dBFS)
seq-3342-4-16bit.wav (16/16): -20.0 LUFS, -3.0 LU (peak: 0.100073: -10.0 dBFS)