Function analyserBasic

analyserBasic(
    onData: (
        freq: Float32Array,
        wave: Float32Array,
        analyser: AudioAnalyser,
    ) => void,
    opts?: Io.Audio.Opts,
): AudioAnalyser
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});
```
An Analyser instance is returned and can be controlled:
```
const analyser = analyserBasic(onData);
analyser.paused = true;
```
Note: Browers won't allow microphone access unless the call has come from a user-interaction, eg pointerup event handler.
Parameters
- onData: (freq: Float32Array, wave: Float32Array, analyser: AudioAnalyser) => void
  Handler for data
- opts: Io.Audio.Opts = {}
  Options
Returns AudioAnalyser
Analyser instance