I recently tried the new Adobe Acrobat 9 free on-line for 30 days. It has 'record a audio comment!' I think a PDF on this website with David teaching in audio would be great! Heres the link: http://www.adobe.com/
Mary I. Oliver - 38 years practice, teach Natural Eyesight Improvement.
Free on-line Better Eyesight Magazine with Translator, Speaker;http://www.cleareyesight.info/naturalvisionimprovementoriginalandmodernbatesmethod/http://www.cleareyesight.info