nerodu

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PDM sound with high sizzle on RP2040

![d6d8ac8de431d4f5d928e8ed28a3973](https://user-images.githubusercontent.com/69945444/161361914-9b575502-0d6c-44eb-8a61-b2e033d4ad1e.png) This is a quiet record without voice. left and right channel looks have many noise. Does the library support wave filter?