I'm not sure if this will provide any help, but I've just looked at the
sample files and performed an FFT (fast fourier transform) anlaysis on
them - the one that exhibits the noise has a 20dB increase in high
frequency noise over the good file, right out to 20kHz.

It's also varying with musical content - the music causes a rise in HF
content, which decays as the music quietens, which gives rise to the
'pumping' effect you can hear between musical phrases.

It strikes me very strongly as a processing / transcoding / file type
error of some description.

Andy.


-- 
Andrew L. Weekes
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