Just to clarify, the Voicelive series have the scale option that does not require a musical instrument to harmonize. You have the option of using midi, keyboard audio, guitar to harmonize from as well. It will also harmonize from an audio output, eg karaoke. Personally, I use a guitar to drive the harmonies and when setting stuff up, the scales. Of course any band member can be playing the keyboard or guitar.
Windows 10 Home 20H2 Build 19042.487 BIAB 2021 (Build 818) Intel(R) Core(TM), i3-4160, CPU @3.60 GHz RAM 16 GB, 64 Bit X64-based processor Zoom UAC-2 (USB 3 interface-built in midi) VoiceLive 3 Extreme, Sputnik Valve Condenser Mic
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