Sound wave thru a tube question

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The discussion centers on the acoustic properties of sound waves traveling through two different tube configurations, both measuring 12 feet in length. One tube maintains a consistent diameter of 4 inches, while the other features a variable diameter: 4 inches for the first 4 feet, expanding to 5 inches for the next 4 feet, and then reducing back to 4 inches for the final 4 feet. The consensus is that the sound exiting the tubes will differ due to the expansion and contraction of the sound waves, likely resulting in a lower tone from the variable diameter tube.

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I have two tubes. Both are 12 feet long. One is 4" diameter for its entire length. The other has a 4" diameter segment for 4 feet, expands to 5" diameter for 4 feet, then reduces back to 4" for the remaining 4 feet.

If the same sound is injected into both tubes, will the sound exiting the far end of both tubes be the same ? Any info would be helpful. Thanks.
 
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No. Because when the sound waves expand to 5", it's like starting with a whole new sound then it reenters the 4" section which changes the sound once more.
 
This is not homework, its for a personal project. I am (obviously) not an engineer.

So the sound exiting is different ? How ? Lower tone ?
 

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