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> http://www.tellun.com/motm/diy/tln867/TLN-867.html
>
> This little piggy is on the breadboard and humming away nicely.
> Thanks to David Brown for his A440 tone generator that was the
> starting point for this utility. It went from a single jack utility
> to a 4-jack, 2-knob, 2-switch, 4-LED monster in just two days.
>
>