> Jinx : in that transistor configuration i don't think i get current
> amplification. I might be mistaken though.

Hi, I didn't mean that specific example, just where the transistor
would be as a low-side device. If I understand what you're trying
to do, the transistor is acting basically as a switch, being driven
hard off and on by the PWM. You'll be able to control the tone
(and volume) to some extent with the duty cycle, varying from
'thin' to 'thick'. An RC filter will help remove the harmonics from
the square wave and soften the sound somewhat. A technique
used to smooth DAC-generated or bit-stream waves

eg

http://www.romanblack.com/picsound.htm

http://www.edn.com/article/CA240913.html

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