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I've thought of a useful feature, if the rockbox guys can do this..
Volume control effects headphone output (obviously)
But line outut is set at the correct true line level setting, and is not effected by volume adjustment.
Perhaps someone can find out what the correct line level voltage is? AFAIK you output a 1khz tone then adjust volume until it's a certain voltage with a multi-meter.
Useful if using headphone output and line-level out to a portable headphone amp at the same time.
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