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.
A really loved making this sound, with an interesting and dancing groove to shake the dance floors!!!
Sample pack Jackin' & Tech House 3
Loop name 07_JTH_Synth_Loop_124_Fm