The noticeable slowing effects of the velocity of sound waves propagating down the interior length of various corrugated tube samples were studied/observed and quantified. Analysis showed that the measured results of the standing wave frequencies produced a sound pitch approximately a halftone lower than the expected frequencies given the standing wave properties of each tube sample. Taking into account length correction due to end effects of the air displacement at the threshold of the tube still shows a wave speed significantly lower than that of the known speed of sound through air. Frequencies measure by placing a sound sensor at one end of the tube to record sounds made by striking the tube agreed with frequencies predicted from directly measuring the speed of sound by using two sound sensors separated by a set distance and mounted interior to the tube to calculate the time a single wavefront took to travel from one sensor to the next.