After experimenting with all those parameters, especially resetting input noise gate to zero, saving the performance, switch to another rig channel, go back to the edited one, then turn the noise gate on to the level where noise begins to disappear, I got the impression, the system now reacts different to my original problem of fluttering dying tones when letting the last note or chord standing and sounding out. Then there is not that heavy fluttering wave I had before. Maybe a result of some caching effect in the profiler, gone away when you save another input noise gate level?
BTW: just changing only input noise, RigManager does not recognize a change, so the save button is not active. Wondering.