The off beat hammer-on requires picking a bass note and the first note of the hammer-on at the same time. The pinch of both notes will be on a beat of the bar but the hammered note is on the following off beat. Study the following example. In the first bar an alternating thumb style pattern is played over a D chord. The second bar is very similar except a hammer-on is played. At the beginning of this bar lift the second finger of the fretting hand off the first string. Pinch the root bass note and the first string (open). This pinch is on the first beat of the bar. The second finger then hammers back onto the first string on the + immediately after the first beat. It is important to let the open string sound for a half a beat and hammer the finger onto the string precisely on the +. Listen carefully to the recording hear the correct effect of this technique.