anchor: Source:getAirAbsorption
  Gets the amount of air absorption applied to the Source.
  
  By default the value is set to 0 which means that air absorption effects are disabled. A value of 1 will apply high frequency attenuation to the Source at a rate of 0.05 dB per meter.
  amount = Source:getAirAbsorption()
  amount number The amount of air absorption applied to the Source.