Please be aware that as recordings have been made by individuals on their own computers, the audio quality and volume will vary from video to video. Some may be particularly quiet and will mean you need to turn your speakers up quite high. Others are particularly loud and will require lowering your speaker volume.
Some groups did not change their screen resolution down to 800×600 before making the recording. In these cases the videos have been resized for optimal viewing on the page so may be of a slightly poorer quality.