// should use binary search!
sclass AudioFrequencyDetectorSpike1 {
  AudioRecognizer recognizer;
  
  int vibrations = 24; // how many periods to look at 
  double centerFreq = 440, step = 1;
  int freqs = 25; // how many frequencies to look at

  IF1<Double> f = freq2 -> div(abs(recognizer.complexSumOfVibrations_raw(recognizer.mainSample, 0, 0, freq2, vibrations)), 32768);

  // returns most likely frequency
  double get() {
    new Best<Double> bestFreq;
    for (int iF : countIterator(-freqs/2, freqs/2)) {
      double freq2 = centerFreq+step*iF;
      double value = f.get(freq2);
      //print(freq2 + ": " + value);
      bestFreq.put(freq2, value);
    }
    ret bestFreq!;
  }
}