I have used several from DigitTech in the past. My current one is the Vocalist live 4. It works great with proper guitar chords. It will recognize the slightest varaition in changes to color the harmony's using guitar or keyboard. Not so with bass guitar. Working from the root note , care must be taken where you press the pedal. Walking bass presents a problem. I play only bass. I use it with care. IMHO I will take it over not so good,too loud,off pitch real harmony any time. Leon