sclass PianoSampler {
  double sampleRate = 48000;
  double currentSample;
  
  persistable sclass Oscillator extends HasKey<Frequency> {
    double currentPeriodStart;
    // all recorded intensities
    new TreeMap<DoubleRange, Complex> intensities;
    
    *(Frequency f) { super(f); }
    
    void record(DoubleRange r, Complex c) {
      intensities.put(r, c);
    }
  }
  
  HasKeyMap<Frequency, Oscillator> oscillators = new(map(f -> new Oscillator(f), pianoFrequencies88()));
  new TreeMultiMap<Double, Oscillator> actionsForSample;
}