The reverse roll is also known as a forward-backward roll.
It usually starts on the 3rd or 4th string and goes: TIM TMI TM
Here are three examples where the Thumb goes on different strings.
If you keep the thumb off the 5th string, you can use this roll over closed chords for playing on any chord.
Here is Bile Dem Cabbage Down using the reverse roll.
Because the melody is played on the 3rd string, we need to make chords higher up the neck to get the correct note on the 3rd string.
