I tested the first board tonight, the triple noise. Two external parts are needed, a 2N3904 with the collector unconnected, the base connected to GND and the emitter connected to IN, and a 50k trimpot for adjusting the gain of the input.
It works perfectly. Rainy white, oceany pink and deep, rumbling red noise. Mmmm... I breadboarded this back in 2017 and had a lot of fun playing around with it with my then 3 year old daugter. "Daddy, can we go listen to the rain?"
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