Did you read this
http://maskarrayed.wordpress.com/what-y ... me-part-i/
I know you have already got your machine but you may need to shop for another DME. Wouldn't hurt to be a little better prepared. Your DME doesn't sound like he is willing to work very hard for you and only wants to give you the cheapest machine available....I would be looking for a new DME if it were me but only you can decide on what you want to accept or not.
http://maskarrayed.wordpress.com/ read down at the bottom about what to do when you have found out your machine is a brick.
A pressure of 9 isn't considered all that high but you aren't the only one to have problems with aerophagia at relatively mediocre pressures.
Can you read this thread? It will save me a lot of typing. It explains how aerophagia becomes a problem from the physical side of things. The LES sphincter not being able to keep the air out of the stomach.
viewtopic.php?f=1&t=37517&st=0&sk=t&sd=a
To be honest...I don't know if exhale relief would be enough relief...especially with the PR System One machines because the reduction in pressure during exhale is based on flow and there may not be enough reduction to give you the relief you need.
Respironics has Flex relief...explained here
http://aflex.respironics.com/
Likewise I don't know if APAP would help with any certainty. It might and it might not. It all depends on where your pressure threshold is.... where below it you don't have aerophagia and above it you do. APAP might let you get by with a lower pressure part of the night and only get up to 9 cm maybe for a short time.
You could try reducing your pressure to see if it helps the aerophagia but with the machine's lack of useful data we don't have any way to know if the lower pressure allows a truck load of events to happen or not.
There are people who do need a bipap at relatively lower pressures due to aerophagia. You wouldn't be the first.
RobySue, one of our forum members, ended up with a bipap auto with pressures that never got over 9. Couldn't tolerate even an APAP machine at 8 cm pressure.
If you had a ResMed machine their exhale relief is more pronounced than Respironics. The ResMed S9 EPR (their exhale relief) allows for as much as a 3 cm pressure reduction during exhale. It might be enough relief for you and it might not. It wasn't enough for RobySue. While EPR is good exhale relief it isn't exactly the same as what a bilevel machine (bipap) offers. It's hard to describe but the timing is just a bit different.
You really need a DME willing to work with you and your issues.
For sure talk to the PA who you have been working with. See what he/she suggests. Call your insurance company and find out exactly what they cover...they will pay for APAPs....its the same billing code as the brick cpap you got. Your current DME is trying to make the most money he can by supplying the cheapest machine he can. Simple as that. Your insurance pays by billing code and not by model name.
I may have to RISE but I refuse to SHINE.