Generally I think music licenses on AudioJungle do not cover any remixing or incorporation in new songs, etc (except minor changes such as shortening a song). If you want to resample/remix music from AudioJungle in a new piece of music, you should contact the author via DM.
For example if you sing along the music (which creates a new song) you should better ask the author. If you just add a spoken voice-over (like in most commercials) it should be OK. Then you should choose the proper license according to the usage (video, broadcast, etc.). The term single use refers to one project, e.g. one video or one commercial.