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
http://www.thumbuki.com/csound/files/thumbuki20080602.csd

The Csound Blog
http://www.thumbuki.com/csound/blog/

Any and all feedback is appreciated. Enjoy!

Best,
Jake