Birotron
From
http://egrefin.free.fr/eng/mellotron/birotronE.php - lots of pics
After a concert at Carnegie Hall in 1975, Rick Wakeman (Yes's keyboard player) met David Biro, who lived in Connecticut. Biro showed him his invention : an instrument that could play recorded sounds without the downsides of a Mellotron (sounds limited to 8 seconds, impossibility to play fast... ). It was a keyboard connected to twenty 8 track cartridge readers (the same kind of cartridge that was used in auto radios in the seventies, especially in the USA). These cartridges had looped tapes, and didn't need to rewind.
Seduced by the prototype, Rick Wakeman created Birotronics with Peter Robinson. This company was based in England, and its purpose was the production of Birotrons. The price of the machine was