Every time I go to change the duration in the stretch and pitch effect, I go to the new duration box, highlight the duration already in the box, and go to enter the new duration i am trying to adjust it to, upon entering the duration I am trying to adjust it to the existing duration adjustment in the box should automatically be erased when highlighted. Instead the new duration that I'm typing in begins to entered in front of the highlighted numbers I was trying to erase. I have to intentionally go in and erase the numbers and then implement the new numbers