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Free Sound Samples?
TwistedSquare asks: "I like to write small games from time to time, and have often wondered about adding sounds. Searching around on the internet, I can find loads of GPL sound libraries but no sound effects/samples that are both royalty-free and free (as in beer). Can anyone suggest how I could find such effects and does anyone else find it odd the contrast between the amount of GPL software and non-GPL-type items in areas such as sound effects?"
(Responding to myself)
In case you need some ideas to get you started:
- Simple musical notes -- m(f) = sin(t/f) where f is the frequency. IIRC, 440hz = A natural below middle C, and you multiply by 2^(1/12) for every half-note higher.
- More realistic notes -- M(f) = (m(f) + c1*m(f*3/2) + c2*m(f*4/3) + c3*m(f*4/2)
... )*k1/(k1+t*k2), where the c's provide harmonics and the k's give a fade out.
- I'm sure a little googling will give even better formulas...
- White noise -- w = random
- Equipment -- w*c1*sin(t/f1) + w*c2*sin(t/f2)
..., where the c's & f's are used to modulate the white noise (because machines typically cycle)
- Rain -- w*w*w
- A waterfall -- c1*w + c2*w*w + c3*w*sin(t/f1+k*rand)
..., where you have 1) a steady roar, 2) some random splashes, 3) random, quasi-periodic fluctuation in flow, etc.
Heck,this could be more fun than writing the game!-- MarkusQ