When I play back one of my songs, the tenor voice sounds fine for a while and then for three notes, the volume drops to barely audible. It returns for the next phrase to normal, but again drops out at the end of another phrase. I have tried changing the playback from Audio Units to MIDI and back, but this doesn't seem to change anything. There are no dynamics changes near these measures.
[I am not a complete newbie, but I am also still just learning this program, so explanations need to be fairly simple.]