Yes, it's possible. How I fixed the same issue: the selected sound driver is my external audio interface, and the RCA connectors (at my audio interface) are: left for speakers, right fot headphones. Both connected to an external mixer, headphones to the tape-in, the signal for the speakers through a di-box to the xlr input, and 2 track to ctrl-room is pressed.
But this can also be done by splitting the outgoing signal from the controller. Just make sure you make from one mono signal two mono signals before sending it to the speakers
