What to select: the card containing the P-SERIES folder — either the card root or the P-SERIES folder itself. That covers DreamStation, DreamStation 2 and System One. The question that comes up every week: "why do I have fewer charts than my friend?" Because the machine records fewer channels, and the app shows you what the machine actually wrote rather than drawing empty boxes. DreamStation 2, and the DreamStation 1 Auto CPAP models, record a flow waveform only — one signal, at a low sample rate. There is no mask-pressure waveform on the card at all. They also do not record tidal volume, respiratory rate or minute ventilation. Those exist on bilevel and ASV machines, not on these CPAPs. So on those devices SomniCharts hides mask pressure, minute ventilation, respiratory rate and tidal volume, and the statistics table shows the channels that exist: pressure, leak, snore, and inspiratory/expiratory time. Nothing is broken and nothing failed to import. A DreamStation CPAP simply writes less to the card than a ResMed AirSense does, and less than a Philips bilevel does. Other things worth knowing Model names. Cards identify the machine by a model number (the 500X/501X family and friends). Devices registered before the friendly-name work still display as their raw number — same machine, older label. Event types. Periodic breathing and variable breathing are real, separately reported events on these devices, not a lumped "other" category. System One cards import as well, with the older feature set of the machine. If your Philips card imports but a chart you expected is missing, say which exact model you have — the answer is nearly always the channel list above. Nothing on SomniTalk is medical advice. Talk to your own clinician before changing therapy.