Was curious as to what was or is going to happen to that sample set. Can't imagine anyone doing all that work for just one's own personal "pleasure". So I wrote to Derek. See what he says.
BTW, my guess would be, as well as that organ sampling was done, it would sound great using Hauptwerk. As good as Hauptwerk is, it can't make a poor sample set sound good.
So it's a combination of HW and a well done sample set.
As well there's other factors such as the computer, the audio system, etc, etc, etc.
Then, too, every major digital organ these days is advertised as using digital samples. along with hybrids.
Rgds,
Ed