Audacity horn loop popping

The pop is caused by the sound file not beginning or ending at 0.0.
You can bring it up in Audacity (Free software), select it all, then select Effect - Volume and Compression - Normalize, and check the box that says "Remove DC offset (center on 0.0 vertically)"
NOTE: Older versions of Audacity it is just Effect - Normalize. The new version put it into Volume and Compression.
 
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