Of course Renoise’s MIDI learn function is great too, but you have to adjust MIDI learn settings for each song, don’t you? If you use Duplex’s configration for bcr2000, you can deal with various tunes by doing just only “plug and play”.
MIDI learn is advantageous to control to the details of a specific tune. And Duplex is advantageous to plug & play for various tunes, I think.
The Duplex manual is here.
Also I’d try to explain [How To Start Editing Duplex Files]. Please refer it too. 
Haha, though I am not so detailed about it, Numark is Akai’s parent company, isn’t it?? (also Alesis?)