Via the Kempa.com
November 22 / Totally Gakken!
....n short, you swing a weight into place above the needle, turn on the motor, and speak into the horn. As the motor turns the platter, the sound vibrations striking the horn are transmitted to the needle, which scratches a linear representation of these vibrations into the surface of... a CD-ROM... For playback, the weight above the needle is reduced, and the needle rides in the grooves it had previously scratched out. The vibrations of the needle are in turn transmitted to the horn, producing the audible playback. Woo, science!
---Hear and see it a video of it in action
http://kempa.com/mp3/berlinergramophone.mov