I find the vocalizer on the PSR 740 to be adequate. The problem with the vocalizer, in most people's opinion, is not the quality of the harmonies but the lack of volume it's capable of putting out. Fortunately, the PSR 2000's vocalizer is supposed to have improved headroom and the capability of producing an extra harmony. It also has some dedicated buttons for the vocalizer, so it will be easier to make changes on the fly.