Listen to the sound clip 11. Aura Shift from Portal - Tier 3 - Video Game Music: 11. Aura Shift 11. Aura Shift This sound is from Portal - Tier 3 - Video Game Music Video game music from Portal - Tier 3 for Linux, MacOS, Windows. Published by Harry Callaghan (Bandcamp) (2012). Go to the full soundboardwith more sound clips Search