It did sound to me as if there were a couple of different barks, but I agree it does sound as if most of them are one and the same, repeated.

If I get time over the weekend I'll try presenting the 'clean' bark out of phase to some of the others to see what happens - though it will still be quite time consuming.

For those who don't understand what I mean... if you play a sound 'out of phase' with itself, you should theoretically get silence - one cancels the other out. An example is two loudspeakers, one connected normally, and the other with the connections reversed. Because this is an acoustic environment, you tend only to get the bass frequencies disappearing, so everything sounds a bit 'thin' until you correctly connect the second loudspeaker.

However, when you take a digital signal and present it out of phase to itself, there are no other factors present so one should cancel the other. This is the principle of 'common mode rejection', a technique of balancing a signal down a 'twisted pair' cable so that induced noise is rejected.

Think of a sine wave, then present an exact inverted sine wave over it, and the result is a straight line...