With Dorico - do I need to have Groove Agent 5 SE and its content installed if I have Groove Agent 5 and its content installed?
As far as I understand the matter, the programs are linked via VST, so Dorico should be able to communicate with Groove Agent 5 (non-SE).
In case of HALion we have some extra preferences where one can tell Dorico to use HALion or HALion Sonic, but I don’t know what happens in case of Groove Agent.
But you can try it out. Make sure you have in the Dorico Preferences under the Play tab a playback template as default which uses GASE. Then set up a new project and add a drum set. Which Groove Agent version gets loaded? Does it work as expected?