To help Daffy, these were the results I got for the first four files of this share:
"auCDtect: CD records authenticity detector, version 0.8.2
Copyright (c) 2004 Oleg Berngardt. All rights reserved.
Copyright (c) 2004 Alexander Djourik. All rights reserved.
Detect mode (0..40 with 0 = most accurate): 8 (default)
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[Track 01.wav]
Detected average hi-boundary frequency: 2.103089e+004 Hz
Detected average lo-boundary frequency: 1.428293e+004 Hz
Detected average hi-cut frequency: 2.131595e+004 Hz
Detected average lo-cut frequency: 2.049020e+004 Hz
Maximum probablis boundary frequency: 2.049700e+004 Hz
Coefficient of nonlinearity of a phase: 8.244348e-002
First order smothness: 5.558912e-001
Second order smothness: 8.912387e-001
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Could not qualify the source of this track.
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[Track 02.wav]
Detected average hi-boundary frequency: 2.084761e+004 Hz
Detected average lo-boundary frequency: 1.699927e+004 Hz
Detected average hi-cut frequency: 2.115631e+004 Hz
Detected average lo-cut frequency: 2.039919e+004 Hz
Maximum probablis boundary frequency: 2.050800e+004 Hz
Coefficient of nonlinearity of a phase: 1.231808e-001
First order smothness: 4.882629e-001
Second order smothness: 8.028169e-001
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Could not qualify the source of this track.
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[Track 03.wav]
Detected average hi-boundary frequency: 2.089824e+004 Hz
Detected average lo-boundary frequency: 1.534780e+004 Hz
Detected average hi-cut frequency: 2.116819e+004 Hz
Detected average lo-cut frequency: 2.030373e+004 Hz
Maximum probablis boundary frequency: 2.051300e+004 Hz
Coefficient of nonlinearity of a phase: 1.009380e-001
First order smothness: 5.220126e-001
Second order smothness: 8.207547e-001
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This track looks like CDDA with probability 43%.
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[Track 04.wav]
Detected average hi-boundary frequency: 2.081400e+004 Hz
Detected average lo-boundary frequency: 1.532186e+004 Hz
Detected average hi-cut frequency: 2.114171e+004 Hz
Detected average lo-cut frequency: 2.024537e+004 Hz
Maximum probablis boundary frequency: 2.048100e+004 Hz
Coefficient of nonlinearity of a phase: 1.042642e-001
First order smothness: 5.418994e-001
Second order smothness: 8.212291e-001
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This track looks like CDDA with probability 54%."
So, while in Daffy's test tracks 3 and 4 source could not be qualified, in mine, yes, and it's a mixed result with regards to probability.
I hope someone knowledge on all this can help us sort it all out.
Yara