Optigan

Take a look at these…

Probably not. The earliest design concept for the Optigan was a small organ containing something like an Edison Cylinder. When the keys were pressed, they would push down needles onto the audio tracks. This proved to be completely unstable, though, so the focus shifted to optical means. It’s doubtful that any of these prototypes still [...]

Possibly. Although Mike does not remember ever holding onto any proto discs (and his entire disc archive was thrown in the trash a few years ago), I’ve had one report of a prototype Optigan “Cello” disc. The owner claimed to have acquired it from the Opsonar R&D department in the mid 70’s. It seems to [...]