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Changing notes position based on new bpm

I have a .mboy json file that are build with bpm 128 which is the audio original bpm.

have a look below at the file.

 export default {
"editor": "mboy-editor-2.1.1",
"format_version": "2.0",
"audio": {
    "artist": "test",
    "title": "NO COPYRIGHT SHORT MUSIC (SOLO RECORD)",
    "album": "",
    "subgenre": "",
    "date": "",
    "download_link": "https://www.youtube.com/watch?v=Atv-zwhSyFE",
    "comments": "",
    "genre": "Other"
},
"author": "<zx<zx",
"date": "2022-11-17",
"tempo": 128,
"start_pos": 0,
"tracks": [{
    "instrument": "bass",
    "name": "",
    "color": "ff009fff",
    "bars": [{
        "index": 0,
        "quarters_count": 4,
        "notes": [{
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 800,
            "len": 100,
            "markers": []
        }, {
            "pos": 1100,
            "len": 100,
            "markers": []
        }, {
            "pos": 1200,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 1,
        "quarters_count": 4,
        "notes": [{
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 1000,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 2,
        "quarters_count": 4,
        "notes": [{
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 3,
        "quarters_count": 4,
        "notes": [{
            "pos": 1000,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 4,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 1200,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 5,
        "quarters_count": 4,
        "notes": [{
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 6,
        "quarters_count": 4,
        "notes": [{
            "pos": 300,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 1200,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 7,
        "quarters_count": 4,
        "notes": [{
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 8,
        "quarters_count": 4,
        "notes": [{
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 700,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 9,
        "quarters_count": 4,
        "notes": [{
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 700,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }, {
            "pos": 1500,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 10,
        "quarters_count": 4,
        "notes": [{
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 700,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 11,
        "quarters_count": 4,
        "notes": [{
            "pos": 900,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 12,
        "quarters_count": 4,
        "notes": [{
            "pos": 0,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 13,
        "quarters_count": 4,
        "notes": [{
            "pos": 0,
            "len": 100,
            "markers": []
        }, {
            "pos": 1200,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 14,
        "quarters_count": 4,
        "notes": [{
            "pos": 800,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 15,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 1000,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 16,
        "quarters_count": 4,
        "notes": []
    }, {
        "index": 17,
        "quarters_count": 4,
        "notes": [{
            "pos": 500,
            "len": 100,
            "markers": ["ToLeft"]
        }
        ]
    }, {
        "index": 18,
        "quarters_count": 4,
        "notes": []
    }, {
        "index": 19,
        "quarters_count": 4,
        "notes": []
    }, {
        "index": 20,
        "quarters_count": 4,
        "notes": []
    }
    ]
}, {
    "instrument": "drums",
    "name": "",
    "color": "ff009fff",
    "bars": [{
        "index": 0,
        "quarters_count": 4,
        "notes": [{
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 800,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 1,
        "quarters_count": 4,
        "notes": [{
            "pos": 800,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 2,
        "quarters_count": 4,
        "notes": [{
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 3,
        "quarters_count": 4,
        "notes": [{
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 1000,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 4,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 600,
            "len": 100,
            "markers": []
        }, {
            "pos": 1000,
            "len": 100,
            "markers": []
        }, {
            "pos": 1500,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 5,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 1100,
            "len": 100,
            "markers": []
        }, {
            "pos": 1200,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 6,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 700,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }, {
            "pos": 1400,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 7,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 600,
            "len": 100,
            "markers": []
        }, {
            "pos": 800,
            "len": 100,
            "markers": []
        }, {
            "pos": 1000,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 8,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 600,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }, {
            "pos": 1100,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 9,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 1100,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 10,
        "quarters_count": 4,
        "notes": [{
            "pos": 0,
            "len": 100,
            "markers": []
        }, {
            "pos": 100,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 900,
            "len": 100,
            "markers": []
        }, {
            "pos": 1000,
            "len": 100,
            "markers": []
        }, {
            "pos": 1300,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 11,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 500,
            "len": 100,
            "markers": []
        }, {
            "pos": 800,
            "len": 100,
            "markers": []
        }, {
            "pos": 1200,
            "len": 100,
            "markers": []
        }
        ]
    }, {
        "index": 12,
        "quarters_count": 4,
        "notes": [{
            "pos": 200,
            "len": 100,
            "markers": []
        }, {
            "pos": 400,
            "len": 100,
            "markers": []
        }, {
            "pos": 1100,
            "len": 100,
            "markers": []
        }
        ]
    }
    ]
}
],
"markers": [{
    "id": "extended",
    "code": "*",
    "color": "ffffff00"
}, {
    "id": "ToLeft",
    "code": "<",
    "color": "ffffff00"
}, {
    "id": "ToRight",
    "code": ">",
    "color": "ffffff00"
}
]
}

my game play just fine with the current file, but what I want is to make it slower and that mean I have to change the bpm from 128 to 240.

I have the current pos and len for the bpm 128.

I want to know if I can change the position of the notes based on the new bpm.

I do not want to change the audio file only the notes above so it can follow the new speed and still use the same audio file.

Via Active questions tagged javascript - Stack Overflow https://ift.tt/Dc31zyL
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