Hi

I have downloaded you files and run in Audacity

First I must say the levels were very low and close to the noise floor as you can see in pic one.
After amplifying in Audacity by 19db to bring them up to a workable level (pic two)
You can see that there is indeed an underlying hf even in the first one this gets exaggerated in the second one.
Hope this helps
Mike

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Untitled-2 copy.jpg (203.57 KB, 129 downloads)
Untitled-1 copy.jpg (338.76 KB, 128 downloads)

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