Are you sure your not talking about the BI-PAP ST Machine? I used that before ASV Auto and exactly like you described it was hard to get in sync with it, it was like a ventilator set on a predetermined breaths per minute. The ASV Auto machine responds to your breathing, if you don't need air it stays low if you start to fade it increases a little more if you don't respond it can reach max if it needs to. ASV is such a relief after the BI-PAP ST which stands for spontaneous timed one pressure in one out I don't take the same amount of breaths per minute Im all over the place so I found the ST model uncomfortable, ASV on the auto setting is there only when you need it. If Im wrong and you do have ASV try the Auto setting, if you need a 10 for one apnea you'll get 10 if your in a prolonged apnea it can go up to 25 and when you're breathing again it drops to the low setting until its needed again. I hope this helps, Jason made a good point about the time to fine tune it and find a mask you like. I have a full face because I open my mouth and have to strap it down tight because I have prolonged apneas. Rob