Whenever the time interval of a metro object is specified using tempo-relative time units such as note values, the operation of that metro will be governed by the transport. The metro will only operate when the transport is turned on.

different metro behaviors

There are several ways to control the behavior of the metro via its attributes when it’s governed by the transport. Read in the manual about the @interval, @quantize, @active, @autostart, and @autostarttime attributes of metro.

The when object reports the current time of the transport. The timepoint object automatically reports when a specific moment in time has been reached.