The noise sensor feature is currently experimental and got a bit too much exposure, also thanks to the forum community here (https://www.uradmonitor.com/topic/voice-sensor/). We got to roll it out a bit too soon, and there are major two issues:

1.Apparently, the issue is with the builtin fan, that creates too much noise in the same enclosure with the noise sensor. What happens is sounds below 45dBA cannot be detected.
2.Then the first boards was using an amplifier gain configuration of 100, a bit too much. This created some saturation, that we can see on the data from the various units.

The fix for 2 involves only changing a resistor on the PCB (R28 from 100K to 39K) and updating the firmware. The fix for 1 doesn’t have a solution with the current design.

Attached please see noise-1.jpg illustrating the first issue. 82000071 and 82000088 are assembled and PCB is in the enclosure, while the 82000089 PCB is at first left unassembled.
Probably the best solution is to do the fix with the resistor+firmware, and install the microphone via a longer cable, away from the FAN.