Hi, Someone will have to try it with the " external module" vst system in HA to see if that works. I suppose it will still have the same problems as other advanced vsti. (It runs on Kontakt player, and at last attempt this was not satisfactory as an external module.)
But it certainly is compatible when used in standalone mode with HA. Particularly because it can be set to respond to velocity as HA does, and will by default respond to HA volumes. See the post below about using Garritan, where user Pierrruel went though the process of setting up AMADEUS on his computer.