I'm not making this up:
Some Dutch students have written a VST plug-in which
synthesizes Tibetan throat singing. I'm not making this up. Named Delay Lama, it uses formant synthesis, is MIDI controllable (with the pitchbender controlling vowel sound) and sounds uncannily lifelike. And if that wasn't enough, it draws an animated Tibetan monk, lip-synched with the audio, in the GUI.
Best of all, Delay Lama is free (though donations to a Tibetan charity are encouraged).