This is audio i recorded of my husband using his ten year old decrepit constant positive air pressure sleeping machine. I was trying to convince him that he needed a new one. The variety of sounds he and it managed to make is extraordinary. The intermittent beeping is the machine's warning sound. When i played it for him he cried laughing. I hope you find it useful for something. You'll be please to know his new machine is whisper quiet.
Author: Pitchywobble
