This is the standard that most of producers work on. In these type of projects the base is original from the producer — chords, melodies, leads, etc — but it contains additional melodic elements that complement the track and come from royalty-free sample packs. They are usually vocal chops, real instrument chords or textures, wobbles basses, glitch effects, etc. In a project file of this category you will find MIDI files created by the producer, but also melodic loops
Chords are coming from sample that has been slowed down quite drastically. 808 was made from scratch.
Sample pack Production Master - Lo-Fi Chill & Beats To Study To
Loop name PMHS_Dusty_Melodic_Loop_75_Bm_Vortex