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.
Drums, Vocals, fx-es are samples.
Tha bassline is a melodic loop from a sample pack.
The other melodies and midi’s are fully original.
Sample pack Dirty Music - DJ Csemak Tech Grooves
Loop name CMK_125_Bass_08_B