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.
Process note
Just Serum, Addicted Keys, etc.
Melodic loops
Instrument Rythm Pluck
Sample pack FREE | Deep house selected. style FLP by Sickrate | 2022
Loop name SLCTD Rhythm Pluck 01 G 128BPM