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