Unclear how to add new phonemes

Hello. I have added a new mouth shape (TH) to my FBX and it shows up as a node in the graph and can be turned on manually. I have added the 'TH' shape to my mapping and played with the weights. I have added the 'TH' curve to the curve list and given analysis actor control of it... however, I fail to see how I can get this software use this new shape in its analysis. It simply does not play when the TH phoneme triggers and every time I select 'reanalyze audio', the software deletes my TH curve.

Try going to Tools->Application Options and turning "use new coarticulation" off.

That option can change phonemes behind the scenes with the goal of creating a smoother animation, so it makes troublshooting specific changes to mapping difficult.