Herbie,
I'm not sure that I understand. Do you want to record a track in the song which will then playback and as you sing, the harmony will be there? If yes, this is what Tune 1000 does in their song files and all other sequencer software programs will allow you to do. The SD1 has both chord type vocal harmony and Vocodor harmony. I'm not an expert with the way you use software to record vocal harmony tracks, but AJ, the ketron tech support person would be able to explain more when he comes home from NAMM this week.
George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)