serial mixing console?

[soyt]

Hi all!

This is slightly offtopic but the list is silent so...

I'm looking for a sort of 'general purpose mixing console'
Basicaly, it's just a couple of potentiometers(slide,knob...),
possibly faders, with A/D convertors bound to a simple serial output to
read the levels or events from.
The potential usage of such a device is left as an exercise to the reader.

Anybody knows if it exists (I mean, beside a joystick or a mouse...)?
I guess it's not that hard to built but I'm almost clueless on electronics.
If somebody has pointers (diagrams or so), please let me know.

Thanks