Is the X1850 configurable as MIDI with macOS 10.15 and does it work with Ableton Live? I had to sell my previous X1700 because support after OS X 10.11 was deprecated.
X1700 audio interface was not supported under newer Mac OS. MIDI still worked fine.
Are you asking about X1850 audio interface or MIDI capabilities?
Yes, it does. You have 4 input and 5 output audio channels and MIDI statements send from the X1850 like MIDI Start/Stop can be assigned in Ableton Live. Please see also https://denondjforum.com/t/ableton-link/13592