It all started in 1969 when Felix Visser, a composer specialized in film scores, bought his Synthi-A plus “Cricklewood Dynamic Keyboard”. After a few days a technical problem silenced Synthi-A. Fortunately EMS (Electronic Music Studios of London) had included all circuit diagrams, so the problem could quickly be fixed. A great compliment, incidentally, goes to Peter Zinovieff’s innovative company and their products being accompanied by excellent documentation: particularly clarifying the concept of voltage control and matrix patching in one swell foop.