in the midst of the R&P set up and looked at several videos that attempted to explain what to look for concerning the patterns.
The link below is to the best video that I found;
I thought it is a
* short and easy explanation of how the pattern on the drive side and coast side interact
* liked that the presenter gets to the point without the normal amateur video introduction BS such as: annoying music or bla-bla-bla verbiage.