My SATB vocal score in Notion for iOS currently uses the "Chorus" instrument for both playback and exporting as an mp3. The "Chorus" setting is very difficult to hear because of the heavy reverb. I would like to change the instrument to "Piano" or any other instrument where sound of individual notes can be heard more distinctly. How do I change the instrument? I have been unable to find an answer in the User Guide, on any of the user forums, or elsewhere online. Thanks!