I have a ResMed Airiset 10 “Autoset” cpap machine. It seems to be a CPAP with some of the functionality of a BIPAP. My breathing doc said it is the gold standard or CPAP machines.
At first my machine used constant pressure. When I returned for a follow-up visit with the doc, I complained that my lungs (diaphragm, I suppose) felt tired all the time, making it uncomfortable and more difficult to use the machine.
He changed the settings to that the machine could sense when I was exhaling, and reduce the pressure until I stopped breathing out. I felt the difference that night.
Now, I do not want to sleep without CPAP. I have clogged sinuses frequently, and the machine helps me to breath through the stoppage.