The audio gain pot might need to be exercised or increased. There are two pots on the board. The audio gain pot is the little blue pot(potentiometer) near the edge of the circuit board. Turn it fully clockwise to open it all the way. Mark the original spot first. 1/4 turn should be enough.
When taking apart your sensor mat for it's annual cleaning, I would suggest everybody exercise this pot.
When taking apart your sensor mat for it's annual cleaning, I would suggest everybody exercise this pot.
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