empty.json

[
  [  /* TRACK 1 - kicks  */  
    [  /* measure 1 */ 
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    []
    ],
    [ /* measure 2 */
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    []
    ]            
  ],
  [  /* TRACK 2 - snares */  
    [  /* measure 1 */ 
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    []

    ],
    [ /* measure 2 */ 
      [],
      [],
      [],
      [],
      [],
      [],
      [],
      []

    ]
  ],
  [  /* TRACK 3 - hats   */  
    [  /* measure 1 */ 
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    []
    ],
    [  /* measure 2 */ 
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    []
    ]
  ]
];