cool, I thought it was slated to be done…
however, Im running a 2.2.x dev version as Ive been playing with sysex 
, so couldnt check.
(which I assume hasn’t been merged into mainline release… though Ive not checked)
so this side of ‘midi control’ can now be done with an attenuator → midi cv cc, in similar way as cv output
edit: talking of 2.2, there is alimitation on current release, that may be relevant for OP,.
current 2.1, only supports single midi device,
this experimental 2.2, supports multiple via virtual midi cables (as well as the sysex), I forgot this (as Ive 2.2 loaded, soo take it for granted -lol)
its a more complex topic, you can see discussed here