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On Saturday, June 17, 2017 at 7:13:59 PM UTC-4, Jason wrote:
[This followup was posted to rec.audio.pro and a copy was sent to the
cited author.]

In article ,
says...
the frequency band around 16kHz rises and remains constant.


A bias oscillator?

Had the same thing with a Coasters song, but it was constant, about same frequency. This pops up when the vocals were recorded (mixed).

Jack