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why would you want a beep sound? I just de-soldered the peizo, and now it's bliss, but really It's been quite a while since I've looked at it, but I believe that the sound is more due to the frequency the peizo is driven at more than the differences in the drivers themselves. So I would think that without reverse engineering the circuit (although it's probably a fairly basic circuit anyways) your probably not going to accomplish the task easily.
You could place a basic stamp between the peizo and the board and have the basic stamp driving the peizo, it would probably be the easiest way of hacking it, and you could program whatever tone you feel like listening to.
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