Added detection for overclocking (>=204 Mhz) and extending automaticly polyphony

Added connection von SGTL5000 audio in directly to master_mixer_* port 2 for audio thru.

MicroDexed.ino

@@ -104,6 +104,9 @@ AudioOutputI2S           i2s1;
 AudioConnection          patchCord12(stereo2mono, 0, i2s1, 0);
 AudioConnection          patchCord13(stereo2mono, 1, i2s1, 1);
 AudioControlSGTL5000     sgtl5000_1;
+AudioInputI2S            i2s1in;
+AudioConnection          patchCord17(i2s1in, 0, master_mixer_r, 2);
+AudioConnection          patchCord18(i2s1in, 1, master_mixer_l, 2);
 #elif defined (I2S_AUDIO_ONLY)
 AudioOutputI2S           i2s1;
 AudioConnection          patchCord12(stereo2mono, 0, i2s1, 0);
@@ -444,7 +447,6 @@ void setup()
   show_cpu_and_mem_usage();
 #endif
 
-
   // init master_mixer
 #if NUM_DEXED > 1
   for (uint8_t instance_id = 0; instance_id < NUM_DEXED; instance_id++)
@@ -455,6 +457,13 @@ void setup()
 #else
   master_mixer_r.gain(0, 1.0);
   master_mixer_l.gain(0, 1.0);
+#endif
+#ifdef TEENSY_AUDIO_BOARD
+  master_mixer_r.gain(2, 1.0); // I2S Input
+  master_mixer_l.gain(2, 1.0); // I2S Input
+#else
+  master_mixer_r.gain(2, 0.0); // I2S Input
+  master_mixer_l.gain(2, 0.0); // I2S Input
 #endif
   master_mixer_r.gain(3, 0.0);
   master_mixer_l.gain(3, 0.0);

config.h

@@ -280,17 +280,29 @@
 #define MIDI_DEVICE_USB_HOST 1
 #if defined(USE_FX)
 #if NUM_DEXED == 1
+#if F_CPU >= 216
+#define MAX_NOTES 16
+#else
 #define MAX_NOTES 12
+#endif
+#else
+#if F_CPU >= 216
+#define MAX_NOTES 16
 #else
-#define MAX_NOTES 9
+#define MAX_NOTES 12
+#endif
 #endif
 #else
 #if NUM_DEXED == 1
 #define MAX_NOTES 16
 #else
+#if F_CPU >= 216
+#define MAX_NOTES 16
+#else
 #define MAX_NOTES 13
 #endif
 #endif
+#endif
 #define TEENSY3_6
 #endif