Can you please tell me if is possible to use two nk2 at same time?
You can use a MIDI utility like MidiPIPE (OS X) or Bomes MIDI Translator (Windows) to merge the data from multiple controllers into a single output that DMXIS will accept.
Second question is: MIDI send values between 0-127 but DMX used values between 0 - 255 is also the fader in the DMXIS on 100% when the fader in the nk2 is 100% up?
CC messages & Notes are handled as described by ncn, the 0-127 is scaled up to 0-255 by DMXIS.
DMXIS also recognises MIDI NRPN messages, which are like a high resolution CC message. With NRPN, you get full control of the 0-255 DMX range. The NanoKontrol doesn't support NRPN, but others like the BCF2000 do.
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Dave Brown (Author of D-Pro, DMXIS & Show Buddy)
db audioware ltd.