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Add Region

The add_region action adds a region to the timeline.

Data Item	Type	Required/ Optional	Description
`add_region`	object or text	required	Provides information about a region of `music` to be created, or the string “silence” to create a `silence` region
`add_region.id`	number	optional	A unique identifier. If omitted, the Composer creates a unique identifier automatically. NOTE: If an `id` is not provided, the created region cannot be the target of a `copy_region` action in the same timeline
`add_region.descriptor`	text	required	The descriptor `id` needed to compose music
`add_region.random_tempo`	boolean	optional	If set to true, a random tempo based on the specified `descriptor` is selected in the style of `set_tempo` at the start of the region. If omitted, the default is false (the tempo stays the same)
`add_region.random_instruments`	boolean	optional	If set to true, a random collection of instruments based on the specified `descriptor` is selected in the style of `set_instruments` at the start of the region. If omitted, the default is false (the instrumentation stays the same)
`add_region.ringout_at`	number	optional	If provided, from the time provided until the next `silence` or the end of the `span`, the music ends with a “ringout” (instruments play one final note that lasts the remainder of the region)
`add_region.cut_at`	number	optional	If provided, the music continues until the end of the region and then abruptly stops. Note: Currently, the number itself has no meaning
`add_region.key`	object	optional	The `key_signature` active at the start of the `region`

NOTE: cut_at and ringout_at are mutually exclusive. If both are provided, it is unspecified which is used. If both are omitted, a ringout_at is automatically provided two seconds before the end of the region.

Example music Region:

{
    "time": 0,
    "add_region": {
        "id": 1337,
        "descriptor": "happy_classic_rock",
        "random_tempo": true,
        "random_instruments": true,
        "ringout_at": 20,
        "key": {
            "tonic": "bes",
            "quality": "major"
        }
    }
}

Example silence Region:

{
    "time": 15,
    "add_region": "silence"
}