I might be asking some question I should be able to find myself, but I seem to be missing something important. Can I make Dorico play passages that are indicated with “bells up” in the dynamics a lot louder in general? Or when not, in one specific spot? I use Note Performer, and we are talking french horns (of couse)…
NotePerformer does not have it listed in Special Techniques on this page:
which you have probably already found.
Unless just assigning a fff or have those notes as a separate instrument in Dorico assigned to the same sound, with mixer volume up will suffice (even though the sound is different) then use a separate sample library, Spitfire or Orchestral Tools etc. if you do a search.
Others might be able to help further.