Thanks to Jon reminding me, I found a copy of this in a dump of old quad material I had. Can someone confirm that the frequency response is flat, my version has large tones at about 15760 Hz and the second and third harmonics thereof. I note that this is very close to the NTSC tv line frequency of 15750 Hz and may be interference during the recording from a monitor or TV. I have attached a frequency plot for review.
This affects all tracks and is NOT local interference, it is on the source files.
This affects all tracks and is NOT local interference, it is on the source files.
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