Loop editor is a simple audio loop editor. It has two modes. One is 100% free and allows you to add and edit loop points as well as add crossfades to those loop points. The "Plus" mode is $50 and allows advanced metadata editing utilized in ACID and Apple Loops files.
Designed in Cocoa from the ground up, Loop Editor proudly takes advantage of Quartz, CoreAudio, and other solid OS X interface features.
Loop Editor supports all audio file formats that support loop markers, including every type of looping available for any given format. Loop Editor is one of the only applications available that manages multiple loop makers (within files that support multiple loops).