This is amazing:
http://youtu.be/062Fav5WvZk
Is is similar to what you played or heard, Mark.
Absolutely. Bastogne walnut is a rare, naturally occuring hybrid between two walnut species that is particularly dense and hard. Bob Taylor refers to it as "Rosewood on steroids". George Lowden compares the projection to mahogany and the overtones to rosewood, but with more midrange and fundamental clarity.
The Adirondack top allows for max clarity, projection, and note separation. While I don't have experience with Engelman, I own guitars topped with Adi, Sitka, Mahogany, Cedar, and sinker redwood.
George Lowden likes cedar tops on small bodied walnut guitars, and redwood on medium sized guitars..