Having more problems here - I don't know if it's this program or something else in my 'system' causing erratic occurrences/changes, so I suspect that what happens (in the score) is not always what's Supposed to happen! Anyway, my question has two parts:
1. How does a voice's 'instrument' get changed (accidentally)? and
2. How do you change it back? I assume that a voice's instrument stays with it (when getting 'exchanged'); in one score, whether I select Voice 1 or Voice 2, and change the instrument (in Mixer>Sound field), it changes both voices. In another score, there is one 'part' that I cannot change, even after Exchanging w/ other voice. I found a 'workaround' - going to Staff/part properties and selecting [general] instrument ("Voice") but it changed the (treble) Clef to one without the '8' ('octave' - used in Barbershop) plus, I couldn't choose a specific instrument. So, back to my question(s) - is there a way to change instrument of one voice? I'm sure this is done in orchestral scores. I've attached a score this time!