By Pressing Down a Special Key It Plays a Little Melody

Touch any stage other than 8 to run the sequence, which stops at step 8. With the Dynamic Envelope or Gate, turn step 8 on the Strength row down to make the sequence go silent at the end, or up to let the last note keep re-triggering at the current speed. The 0-CTRL makes no sound: patch its Pitch CV and Dynamic Envelope (or Gate) to an instrument to hear it.

Source: 0-CTRL manual (Make Noise), Patch Corner, page 27.