A callback to the host for musical context information.
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@property(copy, nonatomic) AUHostMusicalContextBlock musicalContextBlock;
@property(copy, atomic) AUHostMusicalContextBlock musicalContextBlock;
An audio unit accessing this property should cache it in realtime-safe storage before beginning to render.
This version 3 property is bridged to the version 2 HostCallback_GetBeatAndTempo and HostCallback_GetMusicalTimeLocation callback members in the kAudioUnitProperty_HostCallbacks API.
A callback to the host for transport state information.
Information about the host context in which the audio unit is connected, for display in the audio unit’s view.