Reader Marek sent word of MZ-101 – a new Javascript based synthesizer that works in your Web browser:

MZ-101 is a monophonic synthesizer, modeled on the old analog synthesizers of the 70’s and 80’s. Use the QWERTY keyboard to play notes too.

Warning: this probably only works on the latest version of Google Chrome, on a fast computer. I tried it in firefox, and although it makes a sound, it doesn’t really work. Please let me know if it starts working in firefox. It’s DSP processing is quite rudimentary, but it’s just a proof of concept at the moment.

You can try it out here.