Hi Rick,
The status of the parameter "Vocal Harmony On/Off" can be saved directly in MIDI files (when "Vocal Harmony/Mic Setting" is ticked in "MIDI Multi Recording > Setup") and/or can be memorized to Registrations (when "Vocal Harmony/Mic Setting" is ticked in the "Registration Memory" window (after pressing the "Memory" button)).
In your case, the "Vocal Harmony On" status is probably stored either directly in the MIDI file or, if you work with Registrations, on Registration button #1.
Best regards,
Chris