The first? video on YouTube of a MC707 being MIDI controlled by a Tenori-on! It works, and I thought you might like to see it. YAMAHA, DON"T CANCEL THE TNR-E APP FOR IPAD! Please remind them that you still want to play it.
You can control the 8 tracks of the 707 with the first 8 tracks of your TNR w, you could also bring in the audio from the TNR to one of those tracks if you wanted to. (I didn't do that here.)