I have calculated that on a normal oud, you can get about to 3 octaves if you are a normal musician . if you are capable on going to higher positions, that could expand a little, although these are just my calculations, and I need to ask about this

not much point going higher, no resonance <_< , perhaps adding more strings is the solution, although the pegbox and the neck would have to be rebuilt <_< .

I think that's a job for mr krishna :P

got a nice link, for those who have real player,

this is an excellent semi-improvisation, they didn't say which mode it was, sounds rather like minor to me. (if you have perfect pitch, I'ld appreciate the tip)
http://www.zeryab.com/taksim/fareed/kelmetetab.ram

trying to find something in mp3 <_<
even the clarinet improvisations are in real format , only the vocal ones and the violin bits are in mp3.

ah well, this is an iraqi player, improvising in a turkish mode, using a very high tuning.

http://Zeryab.com/taksim/others/Taksim_Muh...unir_Bashir.mp3

hope you like it.