Does anyone know what Abode product will allow me to write with a stylus (on a Sony tablet) on a PDF and at the same time redord audio. And then allow it to be played back. I am math a teacher and I would like to upload an example question (PDF) for my students into a program. then i would like to be able to complete the example by writing with my touch screen and i would like some audio to acompany it. Then i want to save this and post on my class web page.