Hi, I use the reference line on the Datascope System 97 to mark the position of augmenation or offloading pressures then adjust the inflate & deflate controls to obtain the best trace and pressure values. For example mark the position of the diastolic offloading point then move the deflate slide all the way to the left - now bring it back slowly to get the lowest value, when it starts to climb from that value back off a little and you should be set to optimal offloading. It takes a little practice but works for me!