> > 1)Will i be able to record sutoff/resonance etc.. changes to a
> > sequencer say cubase sx?
Most likely, NO. Most MIDI kits only record note-on/note-off, but there are some other expensive ones (if you can find them) that will interface more completely.
> > 2)I`m not sure if to modify the polysix with the white noise
> > options and the progrmmable pitch bend et.. options, (to retain
> > the originality of the polysix). What do you guys think?
If you are worried about the originality of the P6, why are you putting a MIDI kit into it? It's your machine, do what you want!