Hi Folks!

I am looking for a way to produce simple "lo-fi" audio
from a microcontroller pin, in a way that is very low cost.
In that sense, I am looking for a simple circuit, but don't 
mind if there's some complexity in the software to drive it.
Think "toy" quality, not anything more.

The circuit I am considering is simple: just a small speaker (8 ohm) connected
to 
a microcontroller pin through a series resistor (100 ohm).
There is also a small cap (e.g. 0.1uF) in series with the speaker to create
a crude low-pass filter.
This is pretty good at generating raspy-sounding square waves.
But, I am hoping that with some software tricks, I could do better,
and possibly play some digitized sounds (simple speech, etc.).
The microcontroller is of the $2-3 variety, and does not have a D/A.

Anyone have a cool hardware/software hack for doing audio on the cheap?

Thanks!  (this is my first post.. yikes)

-rolf
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