I have a lot of transition tracks in my library that start with a slower or faster instrumental of the original track. For example I have a track that starts with 75 BPM and changes to 90 BPM after 32 bars. I made 3 beatgrid zones in that track of which I can only manually edit the bpm of the last zone. When I try to enter 75 BPM on the first zone it automatically snaps to 74.747 BPM which does obviously not fit the grid. How can I change this. Is there an option that I can switch off?