code: function() {
      this.jsonInit({
        "message0": Blockly.Msg.SOUND_SETEFFECTO,
        "args0": [
          {
            "type": "field_dropdown",
            "name": "EFFECT",
            "options": [
              [Blockly.Msg.SOUND_EFFECTS_PITCH, 'PITCH'],
              [Blockly.Msg.SOUND_EFFECTS_PAN, 'PAN']
            ]
          },
          {
            "type": "input_value",
            "name": "VALUE"
          }
        ],
        "category": Blockly.Categories.sound,
        "extensions": ["colours_sounds", "shape_statement"]
      });
    }
docs: Block to set the audio effect
  @this Blockly.Block