I am trying the harmony area with no midi melody. It is set to follow the chords. Are there some "stock" settings that sound good for, say, one down and one up male & female singing? I had it pretty good once. It sounded like a female harmonizing with me, but there are so many variations, that now it sounds squeeky. How about all the style choices under the sliders, do they change the timbre of the voices? I read the small blurb in the manual, but there just aren't enough examples to give a good overview of the product.