Many thanks for directing me to the video. I’m starting to get my bearings now, and have been able to get Studio Brass to respond both to articulations and to dynamics. There’s just one more jigsaw piece to get into place, which is how to get ‘normal’ playback to resume after an articulation, so I’ve put that particular question in more detail in a thread which has been discussing a related issue: Legato playback on natural switch : note length issues? - #15 by Gareth_Glyn
But I certainly wouldn’t have got this far without your help, @Janus - thanks.