There are many ways to do this, but I do it by double-clicking on the MIDI clip to open the clip viewer. Click on the Show/Hide Envelope Box button, select Volume from the Control Chooser drop-down box. Then, instead of creating breakpoints - select the Draw Mode Switch pencil at the top right of the DAW and left-click between the grid lines on the clip view editor to create blocks of silence. You can get the stutter effect if you do this in 16ths (right-click to see the grid editor).