additive synthesis
Articles about additive synthesis:

Native Instruments today released RAZOR, its new software additive synthesis synthesizer, designed together with electronic artist Errorsmith.
You can get an in-depth look at how Razor works through the video above and find out why the new synth is like a microwave oven, jiggling reverb and all.
RAZOR is available for download purchase in the NI Online Shop for $79/69 EUR.
If you’ve tried Razor, leave a comment with your thoughts! Read more…

This is a demo of Twinthesis – a Mac software synthesizer, designed to explore the ‘sound’ of Twitter.
Developer Sam Harman describes Twinthesis as “an attempt to sonify the human randomness being generated on the service”:
The aims of this project, are to create a synthesiser capable of both additive and granular synthesis using live tweets to generate and manipulate the sound. The synthesiser currently calls twitter once every 30 seconds, so a new tweet is used to generate the sound every 30 seconds. The synthesis engine, has an element of performance to it, and can be used to create experimental music.
A full scientific paper and report can be downloaded about twinthesis, detailing aspects of how the patch works, and certain constraints of the project in it’s current state. Twinthesis is a free app for Macs.
Note: This synthesiser is still in development and can be considered an experimental beta version.