Well to be able to have control over the volume slider / bar would 
be a step in the right direction for me.

And yes I know the volume bar would not be very accurate. My theory 
is to calibrate it once and a while (start both the slider and the 
receiver volume at zero). So I have to disagree with it not being 
useful, but I agree it won't be very accurate.

Maybe an idea would be to provide a sort of slider widget with 
decrease value and increase value actions.

 
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