I believe you can do all that.
There is a setting for turning the lead vocal off. Program as step one by hitting step button Then turn lead vocal back on and turn off Harmonizer and program as step two.
Each time you hit step you go back and forth between one and two.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer