It may be useful, for e.g. data that is generated randomly or after a script, to embed a variable's content inside a text to be spoken
e.g when a variable with id 5 is "124"
speech: "Your password is {5}". -> "Your password is 124" (without actual audio of course).
Or, to display the entire text from the content of a string variable.
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Comments
This can be done with text tokens. In the case of a Variable with ID 5:
See the Manual's "Text tokens" for a list of all those available.