Just continue playing 8th notes during the roll, playing buzzes instead of taps. Ex. 13-24 call for a 7-stroke roll, so play the release note on the & of 4 as a tap. They're the same as the exercises on p. 11, but substituting multiple-bounce strokes for each double stroke.
So, ex. 1 would be alternating 8th notes with taps on 1&2& and buzzes on 3&4&. Ex. 13 would be the same thing with buzzes on 3&4 and taps on everything else. Note that they're not going to sound like rolls until you get up into the half note=~100+ range.