The on beat pull-of requires picking a bass note by itself and then picking the first note of the pull-off immediately after on the following off beat. The pull-off note occurs on the following on beat. The pull-off note is sounded exactly at the same time as the next bass note is played. Study the following example. In the first bar an alternating thumb style pattern is played over an Am chord. The second bar is very similar except a pull-off is played. Pick the first bass note of the second bar, following by the second string, remembering that this is the string that is normally played in this pattern. The first finger of the left hand then pulls away from the second string at exactly the same time the right hand thumb plays the bass note on the second beat of the bar.
Pull-offs are featured in the next example. The Dsus and Esus chords were introduced in lesson 11.