How to set bus on apple's AudioUnit 3D Mixer?

Question

I'm trying to figure out how to query or setup which sound is connected to which bus input of the 3D Mixer. Say I have an explosion sound, is there a way to specifically set which bus that sound will be located on for future reference?

Answer 1

Assuming you are working with an AUGraph(), this is pretty straightforward: Just connect the node to the desired busNumber of the mixer.

// connect the file player's output to the mixer's input
checkResult( AUGraphConnectNodeInput(audioGraph,
                                     filePlayerNode,
                                     0,
                                     mixerNode,
                                     1, // this is the first bus #1 "AUGraphConnectNodeInput(filePlayer:out -> mixer:in");