[gentoo-user] Voice synthesizers? (not neccessarily TTS!)

Hi,

I am looking for a (not neccessarily GENTOO) software, whith which
it is possible to synthesize the human voice (male / female).

It does not neccessarily need to be a TTS (I tried some) -- but the
voice needs easily to be tuned in the sense of pitch and sound.

Suppose you want a synthetic voice of Frodo talking some Tengwar (and dont
want to mimic the movies actors ;) or the northern slang of some Elbish ... ;)

Another example would be vocaloid (commercial product).

Is there some software of this kind somewhere for Linux?

Thanks a lot for any voice coming up for this ! :)))
Cheers
Meino