Organ layout

Note only the music in the first measure is encoded here.
{
   "mnx": {
      "support": {
         "useAccidentalDisplay": true
      },
      "version": 1
   },
   "global": {
      "measures": [
         {
            "key": {
               "fifths": -3
            },
            "time": {
               "count": 3,
               "unit": 4
            }
         }
      ]
   },
   "layouts": [
      {
         "id": "organ3Staff",
         "content": [
            {
               "type": "group",
               "content": [
                  {
                     "type": "staff",
                     "sources": [
                        {
                           "part": "organ",
                           "staff": 1
                        }
                     ]
                  },
                  {
                     "type": "staff",
                     "sources": [
                        {
                           "part": "organ",
                           "staff": 2
                        }
                     ]
                  }
               ],
               "symbol": "brace"
            },
            {
               "type": "staff",
               "sources": [
                  {
                     "part": "organ",
                     "staff": 3
                  }
               ]
            }
         ]
      },
      {
         "id": "organ3StaffSplitOber",
         "content": [
            {
               "type": "group",
               "content": [
                  {
                     "type": "staff",
                     "sources": [
                        {
                           "part": "organ",
                           "stem": "up",
                           "voice": "Main"
                        },
                        {
                           "part": "organ",
                           "stem": "down",
                           "voice": "Oberwerk"
                        }
                     ]
                  },
                  {
                     "type": "staff",
                     "sources": [
                        {
                           "part": "organ",
                           "voice": "Hauptwerk"
                        }
                     ]
                  }
               ]
            },
            {
               "type": "staff",
               "sources": [
                  {
                     "part": "organ",
                     "staff": 3
                  }
               ]
            }
         ]
      }
   ],
   "parts": [
      {
         "id": "organ",
         "measures": [
            {
               "clefs": [
                  {
                     "clef": {
                        "sign": "G",
                        "staffPosition": -2
                     }
                  }
               ],
               "sequences": [
                  {
                     "content": [
                        {
                           "duration": {
                              "base": "quarter"
                           },
                           "rest": {}
                        },
                        {
                           "duration": {
                              "base": "eighth"
                           },
                           "rest": {}
                        },
                        {
                           "id": "main1",
                           "duration": {
                              "base": "eighth"
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "octave": 4,
                                    "step": "G"
                                 }
                              }
                           ]
                        },
                        {
                           "id": "main2",
                           "duration": {
                              "base": "eighth"
                           },
                           "notes": [
                              {
                                 "accidentalDisplay": {
                                    "show": true
                                 },
                                 "pitch": {
                                    "alter": 1,
                                    "octave": 4,
                                    "step": "F"
                                 }
                              }
                           ]
                        },
                        {
                           "id": "main3",
                           "duration": {
                              "base": "eighth"
                           },
                           "notes": [
                              {
                                 "accidentalDisplay": {
                                    "show": true
                                 },
                                 "pitch": {
                                    "octave": 4,
                                    "step": "A"
                                 }
                              }
                           ]
                        }
                     ],
                     "staff": 1,
                     "voice": "Main"
                  },
                  {
                     "content": [
                        {
                           "duration": {
                              "base": "quarter"
                           },
                           "rest": {}
                        },
                        {
                           "duration": {
                              "base": "eighth"
                           },
                           "rest": {}
                        },
                        {
                           "id": "ober1",
                           "duration": {
                              "base": "eighth"
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "alter": -1,
                                    "octave": 3,
                                    "step": "B"
                                 }
                              }
                           ]
                        },
                        {
                           "id": "ober2",
                           "duration": {
                              "base": "eighth"
                           },
                           "notes": [
                              {
                                 "accidentalDisplay": {
                                    "show": true
                                 },
                                 "pitch": {
                                    "octave": 3,
                                    "step": "A"
                                 }
                              }
                           ]
                        },
                        {
                           "id": "ober3",
                           "duration": {
                              "base": "eighth"
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "octave": 4,
                                    "step": "C"
                                 }
                              }
                           ]
                        }
                     ],
                     "staff": 1,
                     "voice": "Oberwerk"
                  },
                  {
                     "content": [
                        {
                           "duration": {
                              "base": "half",
                              "dots": 1
                           },
                           "rest": {}
                        }
                     ],
                     "staff": 2,
                     "voice": "Hauptwerk"
                  },
                  {
                     "content": [
                        {
                           "duration": {
                              "base": "half",
                              "dots": 1
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "alter": -1,
                                    "octave": 3,
                                    "step": "E"
                                 },
                                 "ties": [
                                    {
                                       "target": "pedNote2"
                                    }
                                 ]
                              }
                           ]
                        }
                     ],
                     "staff": 3,
                     "voice": "Pedal"
                  }
               ]
            }
         ],
         "staves": 3
      }
   ],
   "scores": [
      {
         "name": "defaultScore",
         "pages": [
            {
               "systems": [
                  {
                     "layout": "organ3Staff",
                     "layoutChanges": [
                        {
                           "layout": "organ3StaffSplitOber",
                           "location": {
                              "measure": 1,
                              "position": {
                                 "fraction": [
                                    3,
                                    8
                                 ]
                              }
                           }
                        }
                     ],
                     "measure": 1
                  },
                  {
                     "layout": "organ3StaffSplitOber",
                     "measure": 6
                  }
               ]
            }
         ]
      }
   ]
}