I believe I understand what happens inside an air column that is open at both ends when you cause a disruption such as blowing into it. But I am not sure what happens in the space between the air column and your ear. Please let me explain what my current understanding is and tell me if I'm wrong. The ends of the open air column are observed to be pressure nodes and the air around the column has a characteristic speed at which sound travels. When the column is disrupted, the air in the column moves such that the pressure is a superposition of the standing waves that fit onto the column's end nodes (multiples of half-wavelengths). Additionally, each of the component standing waves is equivalent to two traveling waves moving in opposite directions, which can be used to determine the frequency at which each of the standing waves oscillates. Now my guess is that the sound coming out of each end of the column is a diffracted version of the superposition of the traveling waves moving in each direction through the column. Is this correct?