I have a new CPAP as well. From 2008 on I had a ResMed that worked well, but after many years of use, the bearings have started to fail and it generates a high pitched noise. The new CPAP supposedly is setup the same, but it reacts to when I am breathing in or out, by ramping up and down. The noise of the variable speed drive certainly is not good for sleep. Worse is the feeling that I am gasping for breath as the machine transitions from inhalation to exhalation. I also find that I am snoring though the CPAP. I quit using the new unit and went back to the old one. I am wondering if the settings can be changed so that it operates like the old unit operating at constant speed. The data from the memory card shows that I am snoring and had several events of cessation of breathing with the new machine. Also, has anyone else had similar experience with new versus old CPAPs?