The Gray Audograph stored dictation as grooves embossed in a soft vinyl disc. It recorded from the inside of the disc to the outside. The disc was rotated to maintain a constant linear velocity relative to the stylus by reducing rpm as the stylus moved towards the outside of the disc (as with digital optical discs and the World Record). Constant linear velocity allowed it to hold more audio. Discs came in three sizes, 6 in. (152 mm), 6½ in. (165 mm) and 8½ in. (216 mm), holding from 10 to 30 minutes. The Audograph was manufactured until the company went bankrupt in 1976.

Although President John F. Kennedy's assassination was famously captured by a Dictabelt recording over an open police microphone, less well-known is that a Gray Audograph was recording over a second channel. Both the Dictabelt and the Audograph disc were examined meticulously to determine the location and timing of their recordings (Olsen and Martin 2013). In the end, it was determined that neither microphone was actually in Dealey Plaza at the time of the gunshots.