He Ralf!
I will try once again to explain Variphrase.
Like old keyboards: first you start sampling some words, or a sentence or whatever you like. Lets say the word: "WATER" .
On old keyboards then you could press the C for example and hear: WATER. But if you press the lowest C you would hear: WWWWWWAAAAAAATTTTTTTEEEEEERRRRRRRR (very low sounding of the thing you sampled). If you press the highest C you hear: wtr (really high and fast pronounciation of the sampled word water). But the worst thing was if you play a chord: so the C and the D and the E you hear 3 different waters and all end sooner or later. SO it is a big chaos.
Now with variphrase, Roland managed to sample the word WATER in on tone. No matter how high or low you sing or how much you change the tone during the tape of the sample, you still hear one tone. In this way they could keep the pitch the same which means that wherever you press the keyboard, high C or low C, you will still hear the same speed, but the voice changes from high to low, just like a real singer. Further this means you can press a chord and then you hear an orchestra singing WATER, where all the samples start and end at the same moment, which means you can use these sample during playing and play a complete orchestra without having any chaos. It makes songs so much more beautiful. Imagine a REGGAE style and you play Could You be Loved with you're right hand!! You just NEED to hear this folks!
Hope I was a little bit understandable.
Ilija Petkovski