Singing & Music is to be heard first....then disussed.
So I guess you cannot provide an example either here or in a private email. With all the variables in the human voice, inflection, intonation, depth, key, vibrato,
phrasing, chord input, and much more tangibles.....you can understand why "LISTENING FIRST" makes for a more in-depth discussion on using Vocal Harmony via an arranger keyboard.