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nxtasy.org has an article about making your NXT speak. This prompted me to finish off a small program I had lying around.
Presenting: nxtsay. Simply pass the program a message you want your NXT to say and it will do so. Or alternatively you can give it a file to read out.
Here’s the synopsis:

Speaks the given text on a Lego Mindstorms NXT.
NXTSAY [/Q] [/T:timeout] [message]
NXTSAY [/Q] [/T:timeout] [/F] filename
If the message is not supplied it will be read from STDIN.
  /F          Read message from the given filename.
  /Q          Don't print any output.
  /T:timeout  Specify the time to spend searching for a NXT.
  /V:volume   Specify the volume of the speech (%).

You will need the Lego Mindstorms NXT software installed. The program should run ok on Windows XP and Vista – let me know if you have any problems!

Download nxtsay here

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