import song into pt. then try 'tabbing' to a peak that is a solid down beat. (make sure the 'tab to peak' on top left is pressed.) seperate region. then go a full eight bars later, to the down beat of 9th bar. tab to it's peak. seperate region. highlight the region of eight bars. select edit/'identify beat' and put start at bar 1 beat 1, and end at bar9 beat 1. the tempo will appear and pt grid will lock to it. works best for straight hip hop, dylan drifts, but give it a try.