Download the source, voices and lexicons from: http://festvox.org/11752/packed/
Follow the commands for unpacking and compilation in the script http://festvox.org/11752/packed/build_them . You wish to go through these commands one by one rather than running the script in case there are errors on the way.
Note these tools are necessary in order to do most of the homeworks(SayText "My name is John Smith.")to set new entries in the lexicon use
(lex.add.entry '("edinburgh" n (((eh d) 1) ((ah n) 0) ((b ax ) 0) ((r ow) 0))))To find out phone names use
(lex.lookup "word" nil)on similarly pronounced words