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Ramp Tempo

The ramp_tempo acion specifies a tempo ramp (accelerando or ritardando) to be specified in terms of when it starts, ends, and the final BPM. The initial tempo is the BPM at the time the ramp starts. During the ramp, the tempo is linearly interpolated. This action is identical to creating two tempo change objects.

Data Item	Type	Required/ Optional	Description
`ramp_tempo`	number	required	The tempo, in BPM, at the end of the tempo ramp
`ramp_until`	number	required	The time, in seconds, relative to the start of the span at which the ramp ends

Example:

{
    "time": 5,
    "ramp_tempo": 120,
    "ramp_until": 10
}