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The start() method of the MessagePort interface starts the sending of messages queued on the port. This method is only needed when using EventTarget.addEventListener; it is implied when using MessageChannel.onmessage.
API Channel messaging MessagePort Method Reference start


The most simple example just starts the audio buffer playing from the beginning — you don't need to specify any parameters in this case:
API AudioBufferSourceNode Method Reference Référence start Web Audio API


The MediaRecorder.start() method (part of the MediaRecorder API) is used to start capturing media into a Blob.
API Media Capture Media Recorder API MediaRecorder Method Reference start


The following example shows basic usage of an AudioContext to create an oscillator node. For an applied example, check out our Violent Theremin demo (see app.js for relevant code).
API Method OscillatorNode Reference start Web Audio API