PAC tranche confusion confusion

chunty

I don't feel that the rules of a PAC tranche are propely explained. Please refer to P395 of V5

Question 1- I understand that if the actual prepayment speed in month 1 is 200PSA, then a PAC investor would receive 508169. What happens If the actual prepayment speed jumps to 210PSA in month 2? Would a PAC investor still receive the lower of the 2 pmts, namely 569843? I'm lookng for more clarity on what happens if prepayment speeds vary within the initial PAC collar.

Question 2- If the actual prepayment speed in mnth 1 is 310PSA, what payment would a PAC investor receive?

Question 3- If the actual prepayment speed in mnth 1 is 80PSA, what payment would a PAC investor receive?