This may already be fixed in v4, but I’m getting some unexpected results running Addictive Drums 2 in Dorico. More specifically (and I don’t particularly need this feature to work, I was just trying out some different drum grooves) I have “Sync Play/Stop” enabled in AD2, and pressing play in Dorico results in the drum groove getting stuck on the first ~16th note and looping it, rather than playing through the whole groove in full.
Unfortunately Dorico doesn’t yet send the required tempo information to VST plug-ins that would allow this feature to work. This won’t be included in Dorico 4.0, I’m afraid, but it is definitely something we plan to add.
Pity! It is one of the important things!