[Goz3rr]

What happens when software is at 0%, your slider is at 100% and you want to raise the volume?

[i_am_proteus]

You must move your slider down, and then up. It becomes reasonably intuitive with a small amount of practice :)

[actionfromafar]

Could have feedback with a LED ramp next to slider, showing the discrepancy...

[usrusr]

Down then up wouldn't be too bad, but up then down could very much be, in certain situations.

[squarefoot]

I would put a safety routine to let the software update only when the hardware is within a certain amount from the actual value, also giving visual feedback of the difference, so that the user could align hardware position to software position without any sudden changes.

[juujian]

You put the slider all the way down to 0, which is then mapped the the range from 0-0 and then you move it back up?!

[i_am_proteus]

Once the fader matches software, software follows the fader.