Pressures, Resmed VpapS9

I would greatly appreciate it if someone would please explain something about pressures on my Resmed S9 Vpap, as I would like to change it myself. Exactly why is it crucial to maintain a gap - and what is that gap exactly? - between the inhale and exhale pressures? I have never understood this and would like to begin setting my own pressures.

Without personal experience with ResMed equipment, here is my understanding of the "gap" in pressures. This is referred to as bi-level pressure. The machine is providing you with a particular pressure when you inhale that is higher to keep your airway open. If there is a gap set, then the machine provides a slightly lower pressure when you exhale. It is easier for some to breathe that way.

The difference between inhale pressure (usually higher) and exhale pressure is a matter of patient comfort. Sometimes it is easier to breathe, sometimes it is to reduce the possibility of Aerophagia (swallowing air), etc. It is generally not necessary for effective treatment. There are some on this forum, who for personal and effectiveness reasons, choose to have both inhale and exhale pressures the same even though their equipment supports bi-level operation,

It would be helpful if you could fill in your equipment profile using text mode in the User Control Panel so we could see what you are using. In addition, it might be helpful if you would comment on the need for changing machine pressures. What problem are you trying to solve?, etc.

Sometimes the inhale and exhale difference in pressure is necessary if there is an underlying lung or muscle issue that makes it difficult to exhale. But like JDS74 says if it is for patient comfort sometimes it is adjusted.
Now if you are in Auto mode and have a Minimum and Maximum number that is a range of pressures that your machine can adjust to if you need more or less pressure.
Do you have a screenshot from Sleepyhead that you can post?