After a really long break, I've finally gotten around to putting up a new post at the Csound Blog. Here's an excerpt:
"Most people would never think of a touch-tone phone as being an additive synthesizer. Though it may be primitive, a phone does generate tones using two sine wave oscillators, which in my humble opinion, qualifies it as such.
However, I'm not here to debate the semantics of whether or not a phone is a synthesizer. Instead, I'm here to demonstrate how easy it is to emulate the sounds of the touch-tone phone."
Touch-Tone DTMF Generator