key to the hosting object's attribute map, at which an action is expected to be found.
Abstract method which must be implemented by creating the actual UGens
during expansion.
Abstract method which must be implemented by creating the actual UGens
during expansion. This method is at most called once during graph
expansion
the expanded object (depending on the type parameter U)
A UGen that invokes an action once the surrounding graph has completed. The action is called with a
Try[Unit]as its universevalue.key to the hosting object's attribute map, at which an action is expected to be found.