Determines whether the bus is active.
- iOS 10.0+
- macOS 10.12+
- tvOS 10.0+
Hosts must enable input busses before using them. This allows an audio unit to be prepared to render a large number of inputs, but avoid the work of preparing to pull inputs which are not in use.
This version 3 property is bridged to the version 2 kAudioUnitProperty_MakeConnection and kAudioUnitProperty_SetRenderCallback APIs.