This wind sound effect generator circuit perfectly imitate the noise of the wind. Transistor T1 is connected as a Zener diode and will provide a noise signal to T2. The amplified signal by T2 is led to a frequency selective amplifier built with 741.
With potentiometers P2a/P2b/P2c you can adjust the middle frequency of the filter and the wind sound. P1 adjusts the intensity of the sound which imitates the wind: an international scale Beaufort of wind intensity will make the adjustment easier.
For P2 you may use a quadruple potentiometer of 15KΩ or 2 pots connected in parallel (P2c). If it is necessary the adjustment of the double T filter may be done for another value of P2. For that you need this formula:
f = 1/2*Π*R*C
R = P2a = P2b = P2c
C = C5/2 = C6 =C7
P2 may be simulated from many trimmer potentiometers (for vertical mounting of the plate).