Giovanni, just select the voice, go to sound edit and look under tone page 1 and 2! (actualy low range is Boys Baa).

Len, I find the idea of finding a soprano (actually Tony Pegler's wife, a professional singer) who sings over 6 octaves quite amusing
All the acoustic instruments play outside their natural range by sample trickery, the alternative is to have unexpected silent keys for players who know nothing about the range of real acoustic instruments!