Edit: The br phoneme is the phoneme used to indicate a breath. However, it is not implemented in all the voicebanks. For example, it’s in Saki AI (Lite), but not Eleanor (Lite). Also, there’s no documentation for this phoneme.
There is an Aspiration Output in the Pro version, but that appears to isolate the “whispered” portion of vocalized sounds so they can be mixed in the DAW, not actual breaths.
There’s a hack of using the hh phoneme, but it’s not optimal.
It’s possible to add just record breaths and add them in the DAW, but a breath phoneme inside Synthesizer V would be helpful in tuning the performance.
I’ve got the Eleanor (Lite) and Saki AI (Lite) voicebanks.
I see that the Eleanor voicebank doesn’t have the br phoneme, but Saki does. I’d actually tried the br phoneme, but only tried it with Eleanor. Why it’s not included (at least retroactively) in the Eleanor voicebank is an odd omission.
Since the Saki voicebank does have it, I guess I could set up a separate track for breaths in the editor. Still a bit of a kludge, but better than having to record the breaths myself.
Interestingly, stretching a breath too long leads to some metallic artifacts. (Interesting because Synthesizer V is quite good at avoiding rendering artifacts, so I hadn’t expected one here).
Since there is a breath phoneme, I’ll modify the top-level request.