Reply to DMC6000 and 1 x DN-S3700 setup question

Hi,

Im selling some old Dj gear and upgrading - I am believeing if buying a Denon DMC6000 and one DN-S3700 (or Dn-S1200 if i dont get a bargain) in the next week.

My objective is to use 3 decks in Traktor Pro 2 on the 6000 and switch between CD and midi control on the 4th Mixer channel (using the 3700).

That way I have all my Cd's as a choice (with plattter control) but also as a backup if the laptop fails during a gig......
I also then get to use the midi capabilities of the cd deck.

My question is - can you set up Traktor Pro 2 to take midi inputs for 3 decks on the 6000 but have the 4th taking midi from a second USB device (the 3700) AT THE SAME TIME?

Two USB's into the laptop i guess...?

Am I right in saying if using midi on the 3700 (once mapped in Traktor Pro 2) the platter wouldnt be usable? (I can live with that limitation as Im not really a scratch DJ)...

Am I also right in saying there would be no need to get Traktor Scratch 2/timecode/additional soundcard with this set up?

cheers