Hello George,
Your bid is for one colorbox and one driver ?
200euro for both plus a driver is really a bargain, if you see what others charge for one gm20 without flags, optics or driver. I think I'll stick to that price.
The driver requires 8 analog inputs and a (24VDC??) supply.
The pots are for offset and gain.
The driver will be shipped with the pinouts, I have to look them up.
Take in account that this kind of mechanical color control is not fast.
You can get a very limited numbers of colors in one frame, and the software will have to know it's working with slow color control.
Sufficient for most beam shows, not for modern graphics.
But with the gradual control of the color flags you can achieve all shades of color fades.
As an extra, this kind of color control has an efficiency off 100% when selecting full white.