I am looking for feedback from teachers about the addition of audio to some video animations I have created for GCSE Science, e.g. this one about white blood cells: www.tes.co.uk/.../white-blood-cells-video-11086117 Does the audio enhance the presentation, adding useful teaching tips etc? Or does it add little, and perhaps even clash with the text on the screen? Any thoughts on the tone of voice, and the quality of the sound? Any other comments? Thanks in advance for your input.