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.
used sylenth , fabfilter , supercharge gt and lfotool plugins for bass.
Sample pack toolroom trademark series - kideko
Loop name T_TTS_K_126_synth_loop_resochord_G