I noticed that you only can select either headphones/stereo outputs OR the individual outputs but not both. I really hope you can change this with the next firmware update dear people of Yamaha. As I need both the headphones AND the option to choose one or more individual outputs. The module is a beast but this is certainly a weaker link and very important for me to use it properly.
I use headphones connected in main audio interface, DTX invidual outs goes to Behringer 8200 and Adat from Behringer goes to Apollo Twin interface.
This method i can control my playing and of course recording from Dtx 900 module!