The Nanokontrol2 will not work to control drawbars on the Yamaha,,, The Yamaha can not receive MIDI code.. and you would have to write code to transmit.. The Nano is designed to use within a DAW, and you would be better off to use the VST organs over the Yamaha..
PS: I decided to keep the Nano. I set it up to do all the transport and mixing within MixCraft...and Organ drawbars too..
thats true, luckilly my K supports teh nano controllers directly over USB...