I played recently a bit with the Festival and Mbrola speech synthesizers.
Literally played.
http://bisqwit.iki.fi/music/misc/smb1mbrola.mp3 (370 kB) (Super Mario Bros)
Here is the Super Mario Bros theme, featuring the voice talents* of Tomohisa Tachiki and Yoram Meron, synthesized using the jp1 and jp2 sound sets in
mbrola.
*) Normally, they're supposed to sound something like
this and
this respectively.
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Created some more in December 5-6 2007...
http://bisqwit.iki.fi/music/misc/elecmbrola.mp3 (1.9 MB) (Mega Man, Elecman theme)
http://bisqwit.iki.fi/music/misc/dmoonmbrola.mp3 (560 kB) (Duck Tales, moon theme)
http://bisqwit.iki.fi/music/misc/ddg2mbrola.mp3 (800 kB) (Double Dragon 2, main theme)
Contains lyrics... completely unintelligible ones though.
This one sounds hilarious.
http://bisqwit.iki.fi/music/misc/smb3gmbrola.mp3 (830 kB) (Super Mario Bros 3, grassy lands)
http://bisqwit.iki.fi/music/misc/smb2mbrola.mp3 (791 kB) (Super Mario Bros 2)
http://bisqwit.iki.fi/music/misc/solombrola.mp3 (600 kB) (Solomon's Key)
http://bisqwit.iki.fi/music/misc/gl10mbrola.mp3 (330 kB) (Guardian Legend, updated)