Hi!
We are a lot behind on the english wiki. Sorry for that. Just for making it clear:
Grouping is done by adding something in brackets behind an effect name. E.g.
Effekt 1 (light)
Effekt 2 (light)
Effekt 3 (sound)
Effekt 4 (sound;light)
If the "Execute only one chaser per group" is activated and you have effect 1 running when starting effect 2 it will end #1.
Effect 3 is still running parallel.
In effect 4 you have two groups assigned by a semicolon. If you start it in our example, it will end both 2 and 3.
The checkboxed above the "intensity" and "speed boost" is tied to it as you supposed. You can even bind that fader to a submaster or control it by commands.
Hoc
Souko 
