Demo Video: Wwise UE4 Integration HD
Read related blog: Volumetric Audio Emitter For Custom Shapes In UE4 : A spline based audio emitter used in combination with Wwise in Unreal Engine 4 By: Troels Nygaard, Technical Sound Designer http://blog.audiokinetic.com/volumetric_audio_emitter_for_custom_shapes_in_ue4