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Help volume problems

The "in and out" seems odd. Back in the olden' days of analog potentiometers and capacitors, such things happened, but with more silicon based chips such issues should not be too common. Seems there may be a voltage threshold issue and Sony may have not provided enough juice through to the 3.5mm jack. Folks would notice this more if using higher impedance head phones, since it would take more juice to provide a steady output.
 
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