Good list of technical peculiarities Claude. For me, the "sound" is those quirks combined with how Chris describes a "cultural" or "contextual" use. I used to be great at knowing the sound of software or hardware sources and could spot Reaktor, or a Roland analogue in moments. But emulations got better and my ears got older, and maybe I began to care less about implementation and more about artistic intent. As Chris says, different tools tend to make you think and work in certain patterns, and I think it is this more than anything that constitutes a "sound".
cheers Andy