I won't beat this horse, but singing effectively with a harmonizer requires much more than good coordination to find the "on" button. Singing in a vocal group, or even a small ensemble requires a totally different style of phrasing. If you think just selecting "1 above" makes you sound like the Everly Brothers ... think again. I practice my vocals much more than my instrumentals because my audience is made up of VERBAL attendees, and NOT musicians. (not usually) Everyone thinks they can sing, and most really enjoy it, so I feature the voice ... I feature the arrangements and I am meticulous with my harmony treatments.

Some of my favorite medleys includs:
Mills Brothers, Andrews Sisters, Beach Boys, Doo Wop groups, Eagles, Beatles and even certain solo artists that feature elaborate choruses like "Me and Mrs Jones" or "Always and Forever" .... both sound dreadful with just one voice ... no matter WHO that voice belongs to. Then there's the specialty numbers .... I could do a whole master class on harmonizers in a solo rig. Wish I had time to do so.

Best quick tip? Sing SIMPLER when the button is on. Vocal groups listen to each other and phrase together. Use your dynamics too ... sneak in with a harmony or back off on one for effect. Listen to the Carpenters - they were masters at lush, creative backgrounds.

If you own a substandard harmonizer - stick to 1 or 2 extra voices and keep them close to your original pitch. Use compression and keep them wet (reverb) for the best blend. The better quality harmonizers do not need as much "sweetening" and can handle heavier loads. I never heard a Yamaha sound good (to me) with more than one voice on. As soon as you hit the second note, it looses something. VH2 was greatly improved , but mostly in performance ... not sound. If you do not consider harmony VERY important, then use whatever you have. If you are like me, and NEED that lush, dense blanket of sound in your shows ... nothing beats the TC stuff. Digitech comes close, but TC is my favorite.