Function analyserBasic

Basic audio analyser. Returns back waveform and FFT analysis. Use analyserPeakLevel if you want sound level, or analyserFrequency if you just want FFT results.

const onData = (freq, wave, analyser) => {
 // Demo: Get FFT results just for 100Hz-1KHz.
 const freqSlice = analyser.sliceByFrequency(100,1000,freq);

 // Demo: Get FFT value for a particular frequency (1KHz)
 const amt = freq[analyser.getIndexForFrequency(1000)];
}
analyserBasic(onData, {fftSize: 512});
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An Analyser instance is returned and can be controlled:

const analyser = analyserBasic(onData);
analyser.paused = true;
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Note: Browers won't allow microphone access unless the call has come from a user-interaction, eg pointerup event handler.