See this post to create a triangle instrument with open and muted sounds. Prepare the MIDI file for import into Dorico using MIDI notes 81 and 80 for the open and muted sounds, respectively. Now import the file into the existing flow in Dorico, assigning the Triangle track to a Drum Set instrument using the Yamaha XG percussion map. Copy the notes from the new instrument with the 5-line staff to the 1-line triangle instrument and then delete the new instrument.
1 Like