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AudioNode: channelCountMode property - Web APIs | MDN
The possible values of the channelCountMode enumerated value, and their meanings are:
max
The number of channels is equal to the maximum number of channels of all connections.
In this case, channelCount is ignored and only up-mixing happens.
The following AudioNode children default to this value: GainNodeDelayNodeScriptProcessorNodeBiquadFilterNodeWaveShaperNode
clamped-max
The number of channels is equal to the maximum number of channels of all connections, clamped to the value of channelCount.
The following AudioNode children default to this value: PannerNodeConvolverNodeDynamicsCompressorNode
explicit
The number of channels is defined by the value of channelCount.
The following AudioNode children default to this value: AudioDestinationNodeAnalyserNodeChannelSplitterNodeChannelMergerNode
const audioCtx = new AudioContext();
const oscillator = audioCtx.createOscillator();
const gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
oscillator.channelCountMode = "explicit";
