>> You can use a PIC10F... and not much else.
>>
I propose a pic10f, a 927-sized lithium coin cell, and one of those
SMT cell-phone sounders; the whole thing would be about 10mm square.

> ...old code for a very convincing cricket sound, modeled
> on a Scientific American article from the 70s.
> (Used in a similar vein on PCs in a school computer lab.)

Hmmph.  In my day, we had to settle for outputting control-G to
idle serial terminals of assorted types in "the terminal room",
trying to duplicate the theme from Close Encounters of the Third
Kind.

BillW

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