1. Executive Summary Expansion Pack 23: Dance Orchestra is a premium sound library for the ReFX Nexus soft synth (versions 2 and 3). Released during the peak of the 2010s "complextro" and orchestral house movement, this pack bridges the gap between classical orchestral timbres and high-energy electronic dance music. It is widely regarded by producers as one of the most iconic and "best" Nexus expansions for genres like Progressive House, Big Room, Trance, and Epic Electro.