Ah, I found this post from October 2015 from one of the developers (if I’m not mistaken!)
so the headphone output can not be individually addressed, there is only the L and R outputs - and the headphone out will output whatever is sent to those individual outs. If I’m not mistaken, but that’s what the quote seems to indicate.
a pity…
which leads me to a follow up question for the devs or anyone else who knows, is there a fidelity difference between the headphone output and the individual outs ? …or any other audio/technical differences to speak of (besides the fact it is a stereo output of course!) ?
often times the headphone output on hardware does not sound as well as the dedicated outputs, and/or has differing gain