After the success of our early programs, we kept on experimenting new techniques to go beyond what we had already done : new options were made possible by having a finer control over the Apple IIGS hardware (pedal to the metal!), but on the other hand, it meant reprogramming almost every aspect of the computer. In retrospect, a lot of hard work was spent on invisible stuff, but altogether, it is that continuous effort on every front that gives such a polished result. They were told it was impossible, so they did it.
This is how the XMas demo was built, even though the technical exploits slightly outgrow the demo content : it was the first demo with music-enabled loading routines, overscan scrolls, and more important entirely coded in Geneva!