This sadly still bothers me every time I open PNGTuber Plus. I have to change my default input device every time.
Creating a new save after adjusting the input device doesn't save the audio device, so I manually have to adjust it every time after opening. Is there any way I can change this? Maybe via a config file somewhere that sets the default audio input device for PNGTuber Plus? This has been bothering me for over 6 months at this point.