April 25th 2012, around 15:30.  We just put in a new sound and the birds seem to be very happy with it.  As of today there are birds nesting on every floor of the house, which pleases us very much. I've been playing around with "Logic" an audio equalizer to make the bird sounds more clear and too boost up the frequency of each chirp.  The new sound that we have tried today was an old sound that we've had for a while, with 2 hours of fiddling around with.  If each bh owner in the world knew what they can do with a mac-book.....would change the game of swiftlet farming forever.