I think the answer is "no". Not on the 740 anyway, Or the Digitech Vocalist Workstation. The Digitech can do "notes" from the keyboard. That is, you sing or say "ahh", press a key on the keyboard and it transposes your voice to that exact key you are pressing.
Now, my dirty little secret. I sing bad. But, with the Digitech, I turn down (off) the lead and the beautiful harmony voices are always perfectly on key! The girls & boys in the chorus sound wonderful! Remember - I am not an entertainer - just playing at home for fun!!
Tom