I've not had to get into the nuts and bolts of air springs before. I've been exposed to a lot of street car related suspension stuff since getting my first MS; a lot of it is new to me given I've not worked on street cars for over thirty years. The idea of using rubber bushings both as isolators and bearings was interesting. Air springs are another interesting item and some recent posts have got me wondering if I am missing something. MS uses what amounts to an air bag built into the upper strut mount as a spring on the active air cars. The dampers are 50mm Bilstein (twin tube although this is just a guess on my part) fixed valving units. What has me puzzled is the idea that the suspension module has control over anything but ride height. Recent posts about "updating the air suspension programming for the P+ option" and others suggesting improvements or changes in suspension performance via over the air software updates have me scratching my head a bit. As I understand them, air springs are a simple air bag. Add more air and the bag gets bigger thus the car goes up. Unless there is a some creative geometry, there is a fixed amount of area that works to "push down" on the damper housing and support the car. PV=nRT suggests that you can have a rising spring rate but this is fixed at design time by the air volume and how that volume decreases as the damper is compressed. Does the above sound like an accurate understanding of the air system? If it is, I really do not see how software updates can do anything but change ride heights and perhaps put the car in a different region of a rising rate spring function. Thoughts?