How to share audio with other members of a meeting?

Are you trying to share a video in the Share pod or via Screen sharing?

Screen sharing only shares the image of your screen (or application), not the audio. Additionally most videos run at 24-30 FPS (frames per second), while screen sharing runs at 3-5 FPS. So a large amount of the visual information being displayed by your video is lost. If this is what you are doing, I'd recommend that you get an FLV or MP4 version of the video you are sharing and upload that directly to the Share pod. The playback will be sync'd among all attendees and the audio will come through their computer speakers.