code: function() {
      this.jsonInit({
        "message0": "%1",
        "args0": [
          {
            "type": "field_dropdown",
            "name": "SOUND_MENU",
            "options": [
              ['1', '0'],
              ['2', '1'],
              ['3', '2'],
              ['4', '3'],
              ['5', '4'],
              ['6', '5'],
              ['7', '6'],
              ['8', '7'],
              ['9', '8'],
              ['10', '9'],
              ['call a function', function() {
                window.alert('function called!');}
              ]
            ]
          }
        ],
        "colour": Blockly.Colours.sounds.secondary,
        "colourSecondary": Blockly.Colours.sounds.secondary,
        "colourTertiary": Blockly.Colours.sounds.tertiary,
        "extensions": ["output_string"]
      });
    }
docs: Sound effects drop-down menu.
  @this Blockly.Block