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Stereo Mixer

Hi

I decided to organize simultaneous play of several sounds with the help of Core Audio.
Based on the examples I have created a graph consisting of Default oUtput and attached a AudioUnitSubType_StereoMixer to it. Here below is my code:

	OSStatus err = noErr;
	AUGraph mGraph;
	AUNode outputNode, mixerNode;
	AudioUnit mixer;
	
	err = NewAUGraph(&mGraph);

const ComponentDescription output_desc = {kAudioUnitType_Output, kAudioUnitSubType_DefaultOutput, kAudioUnitManufacturer_Apple};
const ComponentDescription mixer_desc = {kAudioUnitType_Mixer, kAudioUnitSubType_StereoMixer, kAudioUnitManufacturer_Apple};
AudioStreamBasicDescription desc = {};

err = AUGraphNewNode(mGraph, &output_desc, 0, NULL, &outputNode);
err = AUGraphNewNode(mGraph, &mixer_desc, 0, NULL, &mixerNode );
err = AUGraphConnectNodeInput(mGraph, mixerNode, 0, outputNode, 0 );
err = AUGraphOpen(mGraph);
err = AUGraphGetNodeInfo(mGraph, mixerNode, NULL, NULL, NULL, &mixer );

	// Set mixer kAudioUnitProperty_BusCount (kAudioUnitScope_Input) = 20
	// Set mixer kAudioUnitProperty_StreamFormat (Input/Output)...

	err = AUGraphInitialize(mGraph);
	err = AUGraphStart (mGraph);


Which further steps should I take to play simultaneously 3-5 various stereo sounds out of 10-20 found in the memory while “playlist” is constantly changing.
(e.g. sounds 1, 5, and 7 are being played first, then sounds 5 and 7 stopped and sounds 15, 11, 17 starts instead… )

So I am interested in the following:
- how to organize sounds storage, their “output” into mixer.
- how to stop/ launch to play a separate sound without interfering other sounds being played at the moment?

Thank you in advance!

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