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For the second experience, i had try to make an other wave than the first and There is a resemblance with this.
I had use weakness frequency like 70 Hz and many shape of wave : carré, dent de scie and sinusoid.
Type
Wave (.wav)
Duration
0:30.000
File size
2.5 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Mono