For anyone else using v1.3 on Mac who is still having this problem after trying all of these (AKA if you're like me :(), I finally found a solution that works.
After going through the Stack Exchange solution, I then opened up the "Audio MIDI Setup" application on my mac, selected the mic that I would be using for PNGTuber Plus (ie my Blue Yeti), and for the input, I changed the format from 48,000 Hz to 44,100 Hz.
After that, I reopened PNGTuber Plus, selected said mic, and everything worked!
Hope this helps out anyone still having these issues!
