jsfxr: synthesizing sounds in the browser

https://sfxr.me/

Sfxr, programmed by Tomas Pettersson, and ported to JavaScript by Eric Fredricksen. Forked and improved by Chris McCormick

Parameters and functions provided in jsfxr:

1. Base waveform
2. Envelope
3. Frequency
4. Vibrato
5. Arpeggiation (second pitch)
6. Duty cycle
7. Retrigger
8. Flanger
9. Low-pass filter
10. High-pass filter
11. serialize/deserialize (get settings as text, load settings from text)
12. Buttons (mutate, random, etc.)