isTtsSpeaking()

This function returns 1 (true) if the Text to Speech engine is currently speaking text. If the TTS engine is not speaking 0 (false) is returned.

This function should be used to determine if the prior text is done speaking before new text is spoken.

isTtsReady()

By default Text to Speech will be disabled and you must go to the Menu->More->Settings from the main console screen and enable it before use.