Quantum reality.
This dicates the ultimate noise floor of any sound system for example.
Yes, you can actually hear the individual atoms and molecules banging on the microphone diaphragm. And your eardrum apparently.
The noise floor in electronics is actually related to the number of electrons in the seimiconductor device that comprise the signal. You can't get better than +- 1 electron resolution no matter what you do, with electronics.
If you boost your signal and digitise it accurately enough, that +- 1 electron might be +- 4 bits or so, at which point your quantization noise is well below the digital noise of the (so called) analogue signal anyway.
Just because w like to model the world in smooth continous lineaer functions, doesn't mean that is how the world actually is. It's just a reasonable approximation at the macro level we live at.
At the quantum level is all either yes or no type stuff. The integral of all the quantum states approximates to the smooth functions we think are the natural laws.