ALS files are used by the Ableton Live music production program. It is a digital audio workstation that allows you to produce for live performances as well as for arranging and mixing tracks. ALS files are used to store so-called sets created in Ableton, which in turn make up the overall project. Sets consist of tracks that are already audio data stored in files.

Traces can be exchanged in sets as long as they are within one project. This operation is performed in the program by simply dragging the selected element.