Opps, restore WAV file example

examples/WavFilePlayer/WavFilePlayer.ino

+#include <Audio.h>
+#include <Wire.h>
+#include <SD.h>
+#include <SPI.h>
+
+// Create the Audio components.  These should be created in the
+// order data flows, inputs/sources -> processing -> outputs
+//
+AudioPlaySdWav     wav;
+AudioOutputI2S     dac;
+
+// Create Audio connections between the components
+//
+AudioConnection c1(wav, 0, dac, 0);
+AudioConnection c2(wav, 1, dac, 1);
+
+// Create an object to control the audio shield.
+// 
+AudioControlSGTL5000 audioShield;
+
+
+void setup() {
+  // Audio connections require memory to work.  For more
+  // detailed information, see the MemoryAndCpuUsage example
+  AudioMemory(5);
+
+  audioShield.enable();
+  audioShield.volume(0.5);
+
+  SPI.setMOSI(7);
+  SPI.setSCK(14);
+  if (SD.begin(10)) {
+    wav.play("01_16M.WAV");
+  }
+}
+
+void loop() {
+  float vol = analogRead(15);
+  vol = vol / 1024;
+  audioShield.volume(vol);
+  delay(20);
+}
+