background, post I made about connecting Osmose to Hapax (and found the issue)
ok… tl;dr;
yes it works - testing both in/out and recording/playback.
din directly, usb you will need a ‘router’ (see below)
but its of course not quite as simple as just plug it in 
using midi din
k, this works as expect…
except you need to set pitch bend range in ext midi to 1/96
(you also need to have din mode = dsp in, as per normal)
usb connection
this does NOT work … kind of…
the issue is what appears to be a bug in Osmose firmware…
from what I can see Osmose is NOT accepting midi input on Osmose Port 1!
(even with usb haken mode 1/play)
this is problematic for hapax, as you cannot select virtual ports, it always uses port 1.
however, with my iConnectivity mioXM , I can setup custom routing, so I can get it to work as follows:
Osmose Port 1 → mioXM → Hapax (usb device)
Hapax (usb device) → mioXM → Osmose Port 2 (!)
you will also need to set the pitch bend range to 1/48
(edit: after a factory reset, seems 1/48 is the default)
why is this the case… as I say I think a bug… it seems logical Osmose Port 1 should accept midi.
the reason Port 2 works is although its MPE+, this is a superset of MPE.
why not use Port 2 for input to hapax, as I said above you cannot select it… but also the MPE mode on the hapax has no idea about MPE+ , so may or may not work… also using MPE has a bit less data.