Update.
1.With help from a friend I managed to set the channels right for playback. So now each instrument has a separate channels and effect return works.
2. Playing techniques sorted out. My edited techniques played back, that is for a while, but all of a sudden Dorico stopped playing back any dynamic or playing technique. No matter how I search in all the settings I can come to think of I can’t figure out to get them to play back. What did I do wrong?
/O