Many virtual reality (VR) experiences require transitioning between different environments or scenes in a way that maintains a cohesive narrative and a strong sense of presence. In this report, we investigate and evaluate an audio-visual portal transition technique, where users can both see and hear activity in the destination scene before stepping through the portal. We conducted a user study comparing four conditions: No portal audio or visual information (generic transition), Portal visuals only, Portal audio only, and Both audio and visuals enabled for portals. We have 6 participants, who each evaluated presence, continuity, and preference, as these factors are important to effective scene transitions in VR storytelling. The results show that adding audio- visual previews to portals significantly improved the previously mentioned factors compared to a generic portal without any preview, and of which audio scored the highest in every category.