clipped exponential power scale

gistfile1.txt

float powerScale(mono_float value, mono_float power) {
  static constexpr float kMinPower = 0.01f;

  if (fabsf(power) < kMinPower)
    return value;

  float numerator = mopo::futils::exp(power * value) - 1.0f;
  float denominator = mopo::futils::exp(power) - 1.0f;
  return numerator / denominator;
}