Octatrack -> Digitone -> USB Audio

I would like to take advantage of the Digitone’s USB Audio to send the main out of the Octatack, while at the same time being able to send Digitone’s track(s) audio to the Octatrack.

So something like:

DN L/R -> OT A L/R
OT L/R -> DN L/R -> USB Audio

Does anyone know if this is possible? I know I could just run the OT into an Audio Interface and I often do this, however, sometimes it would nice when I have them downstairs to not have to also setup an audio interface, not least as the DN has one builtin.