hullo,
i noticed there was no node for this, so i put together a wrapper for microsoft’s speech api.
http://vvvv.org/tiki-download_file.php?fileId=2018plugin+help patch
http://vvvv.svn.sourceforge.net/viewvc/vvvv/plugins/c%23/String/Speech/trunk/SpeechSynthesis/source code
also check out:
http://www.microsoft.com/DOWNLOADS/details.aspx?familyid=5E86EC97-40A7-453F-B0EE-6583171B4530&displaylang=en#filelistSAPI SDK (required)
http://msdn.microsoft.com/en-us/library/ms717077(VS.85).aspxTTS XML tutorial, for fine-tuning the output ;)