Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
class	AVFoundationNode	MBS AVFoundation Plugin	15.3	✅ Yes	❌ No	❌ No	✅ Yes	All

The AVAudioEnvironmentNode class is a mixer node that simulates a 3D audio environment.

Any node that conforms to the AVAudioMixing protocol (for example, AVAudioPlayerNode) can act as a source in this environment.

The environment has an implicit “listener”. By controlling the listener’s position and orientation, the application controls the way the user experiences the virtual world. In addition, this node also defines properties for distance attenuation and reverberation that help characterize the environment.

It is important to note that only inputs with a mono channel connection format to the environment node are spatialized. If the input is stereo, the audio is passed through without being spatialized. Currently inputs with connection formats of more than 2 channels are not supported.

In order to set the environment node’s output to a multichannel format, use an AVAudioFormatMBS having one of the following Audio Channel Layout Tags.

• kAudioChannelLayoutTag_AudioUnit_4
• kAudioChannelLayoutTag_AudioUnit_5_0
• kAudioChannelLayoutTag_AudioUnit_6_0
• kAudioChannelLayoutTag_AudioUnit_7_0
• kAudioChannelLayoutTag_AudioUnit_7_0_Front
• kAudioChannelLayoutTag_AudioUnit_8

Subclass of the AVAudioNodeMBS class.