Ableton's Learning Synths website has a bunch of in-browser widgets that explain sound synthesis and make fun noises. WeeeewiwiwiWIWIWIWIWIEEERRRRRR, etc.
On this website, you'll learn the basics of using synthesizers (or synths). No prior experience or equipment is required; you'll do everything right here in your browser. … Synthesizers make sound using electricity, usually with controls that let you change their sound. Some controls change just one specific aspect of the sound, while others, like the box above, change many aspects of the sound at once.
Previously:
• Pixelsynth: fun Web instrument translates images into electronic music
• This web-based Theremin is incredibly fun to play with
• Korg and Moog have made their software synth apps free
