I understand your point, but i can't see why you shouldn't use different midi channels.
Why would you like to have all the controllers on 1 midi channel? just curious..

Its worth noting that when midi mapping parameters, Ableton doesn't differentiate between midi controllers. i.e If a pot on the nocturn is using midi channel 1 cc 1, you can't use the same values on another controller for something else. I have been spending weeks (probably months!) now, just mappi...

how do you want to do this with polyphonic samples and drum- percussionloops?

ahhhh good to know .

busy building a sylenth preset pack, so there will be more of this kind of 'trendy' sounds and more advanced ones!

dorian, phrygian, melodic minor, harmonic minor. (combination of those, example : harmonic phrygian ) try those scales and you'll discover same kind of tones. Tho it's also in the sound design of your synth like others already told you. Next to that the timbre of certain notes. Some are filtered, so...

that are probably some samples, tho they sounds like pitched down bongo's/conga's with a lp filter on it.

what do you mean...
the upraising pad?
the upraising low ring mod/saw wave?
the dark percussion?

Don't know if u use Sylenth1, but i made a preset for you guys who are interested in this kinda bass sounds.

link : http://dl.dropbox.com/u/1730602/BA_Bassquare.fxp

edit to taste