Ditto ditto ditto to UD's post,....Let's not forget you have to know how to sing first and foremost as you get out of it what you put into your vocals & vocal harmony, no workarounds or substitute for that. Using it correctly & when to use it & trigger it is essential as Uncle Dave mentioned above is imperative while playing & ultimately using it as if there were professional background singers behind you is an art form all in itself too. I learned from the Master (Uncle Dave) & will never forget the lessons I was taught watching him perform on stage many many times & will always be grateful for that and so much more. Vocal Harmony is to be taken as serious as is playing your keyboard, if you cant do that don't even use it & embarrass yourself in front of an audience they deserve only the best.. Good Luck.