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.
Melodies in track are made with Serum & Sylenth1 VST's. Also I've used one synth loop.
Sample pack Zenith - Melodic Techno - Zenhiser
Loop name ZEN_ZMT_123_synth_loop_harlequin_Am