Andrew Noah Cap’s guide through Playback in Dorico - with a tour through many of the relevant options and menus has just been published here on Scoring Notes.
As well as some historical background showing just how far Dorico has come (and - to some extent - how far it can reasonably be expected to have come, and to go in the future, given the basis in MIDI for sound generation), there is a useful section on Expression and Percussion Maps.