I think the thing I'm most chuffed about with all the #Datatrak stuff isn't the reverse engineering. It's that I added "wav file output" as an option and one of the people who helped build the system now has it as his phone ringtone.

I'm not far off doing that myself... after some filtering it has a sort of ethereal air about it. To the point someone made a film, "145 kHz", about it.