Reply to HID to MIDI question

I am believeing about building a custom controller from some old xbox controller pcb's and I was wondering, with HID to MIDI, would I have to have the HID to midi application running simultaneously with traktor? If that's the case I might as well stop now because I know my computer won't handle that
I would appreciate if somebody would help me out.

Btw if this project takes off I will most likely be starting a build log in the near future

Thanks again

Edit: Also please say which program you've had the most success with on a mac.