I'd rather not take apart my 08' 888 ATA just to figure it out so I'm hoping someone who has can explain it to me. When you make pressure changes to the main air chamber it affects the pressure of the PAR chamber and vice versa. Is there a floating piston seperating these chambers or what? I don't need to know how ATA works but a better understanding of the relationship between main air and PAR would help me in tuning. Right now I'm running 70 in main and 100 in PAR.