I bought a nord stage 2 about 12 years ago, mostly because I could afford it and probably also because the salesman knew his job. Last 12 years I used the nord stage 2 simply as it came from factory, choosing presets and playing with them, sometimes not even knowing what all those knobs and buttons are doing. So I got a few "unsorted" questions for you, simply to find out more about the options I got with my piano...
1.) Live-Perfomance: For a live performance, it's important to change presets within seconds during a song. So far I just know a five button live function. Is there only this option to perform live or do you know other ways? How do you perform with Nord Stage 2?
2.) Presets: There are a lot of Presets on the piano I never use. So far I hesitated to overwrite something (and the memory seems to be protected, which I could change as I assume), but meanwhile I see this as an option to organize my piano so I can perform better (see 1). Pretending I overwrite preset D:09:1 with an organ on bank A and a slightly louder and stronger organ (for soli) on bank B, and preset D:09:2 for song xy with something else e.g. a wurlitzer, can I also programm the volume? Avoiding volume jumps during the performance? Or is this the wrong attemp for a live performance?
3.) MIDI: Made some experiences with Reason 12 years ago, so the software is here and I wonder how I could use it. I can synchronize the masterclock of the nord stage, or I could use the nord stage to play some sounds from the reason using it as a master keyboard. If I play the sounds of the Reason, I should be able to "command" 16 midi chanels - if I understood it right. Didn't find out yet how to set it up in Reason, but if possible: Is there a way to change midi channels in a fast way on nord stage? Am I understanding this mystery box called midi wrong? Thanks for anything in this topic here..
4.) Electronic Music / Master Clock: Is the nord stage 2 an appropriate Instrument for electronical music? E.g. to sync the master clock, playing with some friends, all with plugs in their ears? I realized that a delay, arpeggiato etc. is still dependend from "my time". Want I want to say, when I press the key, it starts playing in the right tempo, but if I am a bit too late, it plays also offset. Maybe for that kind of music is it just better to use it as a master keyboard and play the sounds from reason? Am I able to adjust filters, lfo etc. with the knobs from Nord?
Well these are my "first" questions, maybe some friendly guys will give me some inputs. Links to documentations, youtube tutorials are also welcome.

[Edit: Just found a pdf from Henrik Larsson on this site. Will read that soon.]