> I'd like to add music this year but can't find a cheap source of
> Holtek tune chips so was wondering what I'd need to make the
> 16F84 (or whatever) sound decent. Obviously a starting point is a
> simple square wave with the roughness filtered. But how do I make
> a richer tone - what harmonics do I need? Is it a simple job of
> adding harmonic square waves suitably attentuated and feeding all
> the outputs to the filter/speaker?

Why not use a 16F87x which has a PWM module to generate sound? It cannot be that
much more expensive than a 16F84, and would surely make better sound. It also
has an A/D converter to digitize sound if that helps.

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