@ offbeat: Basically yes to all your questions.
For external Keyboard use: Keyboard Midi out to OT Midi in. OT Midi out to Nord Lead/Rack. check your Midi settings on both devices. For starting, I recommend the Auto Channel on the OT (normally at Midi 11).
It works great to put a synth like Nord thru the OT to add effects.
Easy way: Main Out from Nord to Input AB on OT. Set one track as a “Thru Machine”, Input AB, choose your effects and voila. You can add neighbor tracks if you need more than 2 effects.
More complex, but better way: Plug each of the individual outs from the Nord into a different input of the OT. Choose 4 tracks as Thru Machines, each one with a different input (A-D), so you can have different effect settings on all 4 voices from the Nord.
you then have 4 more tracks left for sampling your thru tracks, or play samples/loops in flex/static machines.
Good luck, and read the manual 
Andajazz
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