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.
Drop Lead is made up of 3 Layers of Sylenth/ 2 Layers of Spire and 1 Layer of Serum. Mid-Bass from spire. Arp is made up of 2 Layers of Spire. Reese is made up of 2 Layers of Spire. Plucks are made up of 2 Layers of Sylenth/ 1 Layer of Spire/ 4 Layers of Serum. Pad is made up of 2 Layers of Serum. Break Saw is made up of 3 Layers of Sylenth.
Sample pack 789ten - The Jaxx & Vega Ultimate Big Room Pack V.1
Loop name 789JV_STAB_4_D#_134_BPM