Ha - beat me to the punch ;D
These units use steppers, so they are suited much more for the preprogrammed geometrics (tunnels, skies, waves, fences, cones, stars, etc) than animations, etc (which need at least 20k scanners to project smoothly)...
As to the controls - the first DMX channel controls the units patterns (off, static, dynamic, etc) as well as allows you to put the unit into sound active or "demo" mode (where it will run through all preprogrammed patterns and chases). Channel 2 allows you to choose individual patterns, 3-4-5 control X and Y axis position (aiming the patterns) as well as scanning speed which controls the smoothness of the patterns/projections, 6 is a speed control for the moving or dynamic patterns, 7 is the pattern dimension (size) and ch 8,9 control the 2 laser colors (yes, this system uses aligned optics to produce a true yellow, what's nice also is they can be realigned if necessary unlike a lot of the cheap-o RGY units) ...
There are a total of 255 preprogrammed scenes (patterns) and chases (dynamic, moving patterns), also there are a total of 209 steps for RGY mixing (in some steps, the unit will modulate the beams seperately to not mix, allowing red and green to appear simultaneously without mixing)...
I hope that answered all or most of the questions ;D
(Just a note: these are the same model that I have used to put together a couple of GVB units, the optics that combine the beams actually work rather well for violet... I could even be convinced to throw in a pair of heatsink/adaptors for Aixiz modules with these if the buyer wanted
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