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.
4 Layers Bass + 4 Layers. Leads and Synths made in Serum. Sub also made in Serum. Only Serum + Native Ableton Plugins. Sidechain : Kickstart
Sample pack Mainroom Tech House Grooves
Loop name ff_mthg_126_kit_loop_acid_bass_Fmin