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My third idea was a siren sound. To do it, I generated in Audacity a short whistle (with a sinusoïde wave) which I repeated 4 times (for the 4Th time, I slowed down the whistle). Then, I did a fade out and I changed the progressive variation of the heights.
Type
Wave (.wav)
Duration
0:01.116
File size
96.2 KB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Mono