This is an interesting thread inasmuch as I am also confused as to exactly what your needs are. I do a fair amount of Acapella singing, as in a recent show my four part do-wop group performed. in 6 different songs, as another member of the group would be introducing the next number, I would get a very low (volume) pitch from the electric bass player, then start the song in the manner that lots of do-wop music starts, in the bass part. Other members of the group get their pitch relative to this part and join in either a third or a fifth or an octave away depending on the song. Only on one song were we forced to spell out an arpeggio chord so the other three could "hear their note." Is the gist of this problem just finding the correct pitch to begin so that you are in the correct key for voicing and range issues?