In the piano roll, the randomizer can be used to place notes, which you can then define the parameters of randomly. For instance, you can choose only to want notes placed in a specific key and within a certain octave range. As well as this, you can also vary the note length and enable random note glides. You can also randomize the pan, release, two different sets of effects, and the pitch of the desired notes from within the randomizer. These parameters can be found alongside the velocity knob in the 'levels' tab.