Hi Laurie, tx for your help on my thread. As an update, my dad's Trilogy machine has now been replaced with another machine: Oricare V8600. Ever since he has been shifted to this new machine, he isn't feeling comfortable breathing even with the same settings. Idk how to PM, this is the closest I could get to PMing you. Please let me know if I should share the current settings here with other details re my father?