My O1 (188.8.131.52a) has recently developed a popping in the left audio channel of
the headphone output when adjusting the volume of either the MAIN or SUB AF.
The rate of the popping seems to be in sync with the rotation of the AF
controls (optical encoder?) and its volume goes up and down with the audio
volume. In the headphones it sounds just like you ears popping during flying or
diving under water. The popping is not affected by the mode, RF gain, sidetone
volume, MON setting, or any other front panel control setting, except as
described for the AF controls.
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