They are basically all the same on Yamahas.....pitch correction not gonna help you sing better.....you get what you put into it.....the Vocal harmonizers are quirky and MUST be used perfectly with a strong voice and direct positioning besides alot of tweaking to get it right or you will be warbling all over...there is no comparison to TC Helicon, Digitech, and the best I've heard is on a Roland G70, SD1+ is very good also.