tts
The TtsSynthesizer implementation that should be used.
The reading system takes ownership on a successful create and destroys it together with the timeline. If the create call fails or is cancelled, the synthesizer is unregistered and ownership returns to you: either pass it to another ReaderPublication.createTtsSyncMediaTimeline call, or call TtsSynthesizer.destroy yourself, because the reading system will no longer do so. The exception is a create that failed because this synthesizer is already registered with another timeline; that timeline still owns it.