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A neat trick for generating good pseudorandom patterns is to use the cadences of speech. I automated this by taking the text of Alice In Wonderland, passed it through a text-to-speech engine to extract the phonemes and timing information, and then classified the results to get a beat pattern. The following web page contains preprocessed data, and grabs a random 16 beat chunk of the result - voiced on the top line, voiceless on the bottom: http://www.bismuth83.co.uk/~lisa/madhat.html

I'm happy with the PCB, so I will hopefully ship by the end of the week. Now's the time to tell me if your address has changed in the past while. I would just like to check one more component before releasing the BOM, namely series Schottkys across the transistors to help reduce "ghosting" in the matrix. (Hehe!) I will arrange production and shipping of the cases from next week.