faders.pd
This is what I've come up with... ...not very accurate!
Is there a better way?

i made one, where all the faders get there 0s all the time. i made an astraction for the sliders, open the fader.pd patch
faders.zip

@lead This will do it accurately.... with minimal calculation..........
faders2.zip
You can easily expand it out to 20 faders and more, and you can throw away the bits you don't need, like the horizontal faders........
but I have left them in for the example.
David.

Thanks so much guys, these are great!