Headlining the event is Australian electronic wunderkind Flume in his only 2014 Australian shows.
He'll be joined by Chet Faker, Zhu, ScHoolboy Q, Four Tet, YG, Ta-Ku, Totally Enormous Extinct Dinosaurs (DJ set), Shlohmo, Bondax and Yahtzel (DJ set).
Young Fathers, Golden Features and Tkay Maidza round out the initial lineup, with more to be announced.
Listen Out will take place on Saturday October 4 at Royal Botanic Garden's Observatory Precinct. Tickets go on sale this Thursday June 19.