Double-clicking the Sequencer module on a running DX editor causes the Sequencer dialog to appear, as shown below. The icons on the top row (from left) are:
loop, palandrome, single-step, and show-integer-range
The icons on the bottom row are:
reverse-play, forward-play, stop, and pause .

If you click the ellipsis in the upper-right corner of the Sequencer dialog, you will open a window which gives the details of the integers to be generated. In this case, the integers run from 1 to 120 by 1.