I, too, have this problem and am also looking for the answer..
Hoping this may give the issue some traction
First problem I see is that the WAV files are empty...
microchp
It's Probably Me ROUGH DRAFT 200415.blx 37f04ece-5ff7-4840-bb8f-33a85ff6b747.wav null.wav
DirectShow Error 200529.pdf