AUParameterTree
An object that represents a top-level group node that contains all of an audio unit’s parameters.
Declaration
class AUParameterTreeOverview
An audio unit’s parameters are organized into a tree containing groups and parameters (groups may be nested).
The parameter tree is KVO-compliant. An audio unit may choose to dynamically rearrange the tree; when doing so, it must issue a KVO notification on the audio unit’s parameterTree property.