virtual void onSound(AudioIOData& io) {
    static cuttlebone::Stats fps("onSound()");
    static float currentNoiseAmplitude = 0;

    fps(io.secondsPerBuffer());

    float maxInputAmplitude = 0.0f;
    
    // set the pose of our audio source
    tap.pose(Pose(state->p[state->pokedVertex], Quatf()));

    // "f" is the desired noise amplitude based on the state
    float f =
      (state->p[state->pokedVertex] - state->pokedVertexRest).mag() - 0.45;
    
    if (f > 0.99) f = 0.99;
    if (f < 0) f = 0;



    while (io()) {
      // find largest input amplitude of block
      //
      float in = fabs(io.in(0));
      if (in > maxInputAmplitude) maxInputAmplitude = in;

      // Make this 0.0001 so it will sound good
      float ProportionOfErrorToEliminateOnThisAudioSample = 0.0001;
      currentNoiseAmplitude += (f-currentNoiseAmplitude) * 
        ProportionOfErrorToEliminateOnThisAudioSample;

      // output sample directly or write sample to output through our audio source
      // io.out(0) = io.out(1) = pinkNoise() * f * state->audioGain;
      tap.writeSample( pinkNoise() * currentNoiseAmplitude * state->audioGain );
    }

    // poke the blob if the largest amplitude is above some threshold
    //
    if (maxInputAmplitude > 0.707f) shouldPoke = true;

    // set listener pose and render audio sources
    listener()->pose(state->pose);
    scene()->render(io);
  }
  virtual void onSound(AudioIOData& io) {
    static cuttlebone::Stats fps("onSound()");
    fps(io.secondsPerBuffer());

    tap.pose(Pose(state->p[state->pokedVertex], Quatd(1, 0, 0, 0)));

    int popCount = taker.get(*state);
    float f = (state->p[state->pokedVertex] - state->pokedVertexRest).mag() - 0.304134 /* mean */;
    if (f > 0.8) f = 0.8;
    if (f < 0) f = 0;
    while (io()) {
      // XXX rnd::uniformS() should be gamma noise
      // XXX use interpolation on gain
      tap.writeSample(rnd::uniformS() * f);
      // io.out(0) = rnd::uniformS() * f;
    }
    listener()->pose(state->pose);
    scene()->render(io);
  }