I'm back! And now that the olympics are over, I have my monitor back, so I might post a little more often... :-)
The 'Mystery Sound' was made on a Banjo, by muting the strings around the 6th fret and then TAPPING the strings with my metal finger picks -- a very interesting sound! It is amazing what can be done when one is willing to think outside of the box...
Got to go do chores now,