In order to use it, simply click on the record button and it will automatically save the music that you are playing and split up the different tracks. Later, you can name the separated tracks.
The app also normalizes the sound levels so that everything plays at the same volume. From this, you can download higher quality files than if you used similar YouTube downloader app.
Finally, you can save the tracks as MP3s or send them directly to iTunes and transfer them to your iPod, iPad, or iPhone.