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.
Mistic Tech House Track! In this track I used Serum, Kontakt and plug-ins for processing such as: Ozone9, FabFilter, Valhalla and other.
Sample pack Demarzo Underground House & Tech
Loop name SS_DE_123_Synth Loop_05_Cm