This is the synthesized sound of a walkie-talkie beginning to transmit. I once had a walkie-talkie that made this sound as a feedback; this is the same sound, made with audacity. Generating:file > newgenerate > noise (type: white, amplitude: 0. 4, duration: 0. 05s)effects > low-pass filter (rolloff: 36 db, cutoff: 4000)select from 0. 0s to 0. 02seffects > cross fade-inselect from 0. 03s to 0. 05seffects > cross fade-outcursor at 0. 05sgenerate > silence (duration: 0. 5s).
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