Did you do the double link of pin 3 & 4 to ground? Some research says that you have to add a circuit to pin 6 but I would check you are getting a full 5v on pin 1 and a solid ground throughout before experimenting further
Re: PT2399 Noise Generator - Help with schematic to vero.
Finally got a chance to build this up and it’s just emitting a clicking noise. Others on the YouTube demo have similar results. I don’t think the OP included whatever IC3 is and I bet there’s more to the circuit. In any case, just build a Deep Blue Delay and send it into oscillation. It’s basically the same thing!