Baseline Widely available
The channelCountMode property of the AudioNode interface represents an enumerated value describing the way channels must be matched between the node's inputs and outputs.
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: GainNode, DelayNode, ScriptProcessorNode, BiquadFilterNode, WaveShaperNode.
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: PannerNode, ConvolverNode, DynamicsCompressorNode
explicit
The number of channels is defined by the value of channelCount.
The following AudioNode children default to this value: AudioDestinationNode, AnalyserNode, ChannelSplitterNode, ChannelMergerNode
Note: In older versions of the spec, the default for a ChannelSplitterNode was max.
const audioCtx = new AudioContext();
const oscillator = audioCtx.createOscillator();
const gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
oscillator.channelCountMode = "explicit";
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