A preset is edited by selecting the EDIT mode. This button is right next to the cursor buttons, and a red LED will light up on the front panel when you are in the edit mode. To edit in real-time, simply turn the real-time controller knobs while playing the preset. Use the control button to select which parameter you're editing with each real-time knob. For further information on editing presets, please consult the owners manual or the tutorial section of the web site.