> I suppose you have a filter at the output of the pwm (i.e. driving a
> real speaker, not a buzzer).
Right, you need appropriate hardware for generating line-level
or amplified output. Anything from a cap and variable resistor
to a more sophisticated filter/amplifier arrangement. There is
an APPNOTE from Motorola, but I think it has a typo:
There are probably other circuit designs floating around too.
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