Al.

You were luck, some of the instruction were wrong in the translation German to UK and the colors on the resistors, lots of people had burnt finger and popping caps and glowing resistors, I remember listening to the tone generator through headsets after building it. And all those wires between the PCBs if anything went wrong you were in big trouble. Happy days it will never happen again, it was a mad idea, most organs didn't work after a while, it was down to build quality.