I have the 'Maplin' /ETI International 4600. It was built by my dad in the 70's, he was an electrical engineer so the build quality of this is really good. I remember watching him setting up the modules with an oscilloscope. He didn't get to finish it unfortunately, it still needs the long springlin...

I'm sorry for posting on an old thread but there is a deep connection in my topic. I'm in possession of one of these synths and what a wonderful machine it is, that is judged from looking at it as I have no idea how to use it. It was built by my father in the 70's when I was a nipper and I have take...