Changed driver for the TGA_AUDIO_BOARD from master to slave.

MicroMDAEPiano.ino

@@ -74,7 +74,7 @@ AudioConnection          patchCord111(mixer_l, 0, i2s1, 1);
 #ifdef TEENSY_AUDIO_BOARD
 AudioControlSGTL5000     sgtl5000_1;
 #else
-AudioControlWM8731master wm8731m1;
+AudioControlWM8731master wm8731_1;
 #endif
 #else
 AudioOutputPT8211        pt8211_1;
@@ -210,8 +210,8 @@ void setup()
 #endif
 
 #ifdef TGA_AUDIO_BOARD
-  wm8731m1.enable();
-  wm8731m1.volume(1.0);
+  wm8731_1.enable();
+  wm8731_1.volume(1.0);
 #endif
 
   //set_volume(vol, vol_left, vol_right);
@@ -541,7 +541,7 @@ void set_volume(float v, float vr, float vl)
 #ifdef TEENSY_AUDIO_BOARD
   sgtl5000_1.dacVolume(vol * vol_left, vol * vol_right);
 #elif TGA_AUDIO_BOARD
-  wm8731m1.volume(vol);
+  wm8731_1.volume(vol);
 #else
   volume_r.gain(vr);
   volume_l.gain(vl);