Make your own sci-fi soundtracks. Reminds me of the intro to The Outer Limits.
From the BBC c/o kottke.org.
"In the early 1960s, synthesizers did not exist. Instead the Radiophonic Workshop begged and borrowed as many test oscillators as possible from other BBC departments.
"The versatile 'wobbulator' was a sine-wave oscillator that could be frequency modulated. It consisted of a metal box with a few switches and one very large knob that could sweep the entire frequency range."
"Have a play with our simulation of the Wobbulator to create your own space-y sounds, then keep scrolling to find out how we built it using the Web Audio API."