再生はできたが雑音がやばい

audio-test.ino

#include <Arduino.h>
#include <HTTPClient.h>
#include <ESP8266Spiram.h>
#include "SPIFFS.h"

#include "AudioFileSourceSPIFFS.h"
#include "AudioFileSourceID3.h"
#include "AudioOutputI2SNoDAC.h"
#include "AudioOutputI2S.h"
#include "AudioFileSourceSD.h"

#include "AudioGeneratorWAV.h"

#include <M5Stack.h>
#include <Avatar.h>

using namespace m5avatar;

AudioGeneratorWAV *wav;
AudioFileSourceSPIFFS *file_w,file_m;
AudioOutputI2S *out_w, out_m;

Avatar avatar;

void setup() {
  M5.begin();
  avatar.init();
}

void loop(){
  M5.update();
  if(M5.BtnC.wasPressed()){

    //WAVの場合
    file_w = new AudioFileSourceSPIFFS("/nyaan.wav");
    // file_w = new AudioFileSourceSD("/sample.wav");
    out_w = new AudioOutputI2S(0, 1); 
    out_w->SetOutputModeMono(true);
    out_w->SetGain(0.1); 
    // ouputの変数s32がI2Cでピンに与える値
    wav = new AudioGeneratorWAV(); 

    wav->begin(file_w, out_w);

    while(wav->isRunning()){
      Serial.printf("%d", out_w->getLevel());
      if (!wav->loop()) wav->stop();
    }
    Serial.println("end");
  }
}