The base is original from the producer (chords and melodies), but is complemented with elements that complement the song that come from samplepacks, usually, vocal chops, guitars, wobbles sections, glitch effects. It is the standard in which most of producers work, in a project you will find MIDI files made by the producer, but also melodic loops.
Amazing house track. The only loops are the vocals and some top loops on the drums.
Sample pack Arcade by Output
Loop name Feeling it out - Vocode