Show HN: Trckstr an app that converts revision notes into audio (trckstr.com)

Hi, I'm 18 still studying. I began recording my revision notes and listening to them on the bus and train repeatedly. I realized that I learn well by listening. I began sending these recordings to my friends and soon realized that this would probably be useful to all students. So here it is:

http://trckstr.com

PS - Please tell me what you think about the concept.