Hi
Can't get this to work either. As I have a French version of Vista and presumably a ST engine that works in French it still seems to produce gibberish. For example a clear audio of Maison....Maison.....Maison ... produces a non related text.....

At a stretch of the imagination there might be SOME sound similarity but in practice it's useless! Other tests were equally fruitless, often seem to be random text...often hilarious. So IMHO this feature is best left alone. Similar sounding English and French words didn't work either.
For example Table...Table...Table (repeated) came out as...
La Thailande.. Thailande...Thailande.... and Tremblement de terre Tremble....
Obviously a very shaky table (Tremblement de terre is french for an earthquake.
Sorry no good (but funny)
Go here https://speechnotes.co/ and say what you want then save the result as a text file. Use this in VP it seems to work OK.
Nat