The Forward Backward Roll is often given as (strings) 3,2,1,5,1,2,3,1 - this is a useful 8 note pattern but more often than not you need to deviate from it and more often than not it is used as a 'turn around' from D back to G. This document offers some exercises and some applications of these alternatives. Note that it is based upon the 8 note forward roll starting with the thumb - 3, 1, 5, 3, 1, 5, 3, 1 with the last three notes being changed so we get 3, 1, 5, 3, 1, 3, 4, 1, The last three notes is the backward roll part so the index hits the last 3rd string.