sclass PianoSampler {
  double sampleRate = 48000;
  double currentSample;
  
  persistable sclass PerFreq extends HasKey<Frequency> {
    double currentPeriodStart;
    
    *(Frequency f) { super(f); }
  }
  
  HasKeyMap<Frequency, PerFreq> frequencies = new(pianoFrequencies88());
  new TreeMultiSet<Double, PerFreq> actionsForSample;
}