cut out the part you want, then select everything else and delete it, then paste
Audacity is the tool for all your Looping Needs.Mini-Guide: Go to File and import the Music you wanna loop. Go to Tracks and select Stereo Track to Mono, cut out the part you want, then select everything else and delete it, then paste. Change the Project Rate if needed, it will Make it worse Quality but Smaller Size.
how do I change the project rate?