http://www.lisahartwell.com/royalty-f...
In this video I explain how to add ending clips or stings to your loops in Audacity. This process can also be used if you want to extend a current loop with a different loop (rather than just repeating a loop, as shown in the previous video).
The example here is from my own royalty-free music packs but applies to any loops you may have purchased or been given.
The track, once repeated, should play seamlessly without people being able to hear the edit.
To find out more about the music packs I sell, please visit the link above.