Improve digital I/O on Teensy 3.6 with overclocking

input_pdm.cpp

   #define MCLK_MULT 1
   #define MCLK_DIV  17
 #elif F_CPU == 216000000
-  #define MCLK_MULT 8
-  #define MCLK_DIV  153
-  #define MCLK_SRC  0
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 240000000
-  #define MCLK_MULT 4
+  #define MCLK_MULT 2
   #define MCLK_DIV  85
+  #define MCLK_SRC  0
+#elif F_CPU == 256000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 16000000
   #define MCLK_MULT 12
   #define MCLK_DIV  17
 print "\n};\n";
 print "// max=$max, min=$min\n";
 */
-#endif
+#endif

output_adat.cpp

   const tmclk clkArr[numfreqs] = {{32, 3375}, {49, 3750}, {64, 3375}, {49, 1875}, {128, 3375}, {98, 1875}, {8, 153}, {64, 1125}, {196, 1875}, {16, 153}, {128, 1125}, {226, 1081}, {32, 153}, {147, 646} };
 #elif (F_PLL==240000000)
   const tmclk clkArr[numfreqs] = {{16, 1875}, {29, 2466}, {32, 1875}, {89, 3784}, {64, 1875}, {147, 3125}, {4, 85}, {32, 625}, {205, 2179}, {8, 85}, {64, 625}, {89, 473}, {16, 85}, {128, 625} };
+#elif (F_PLL==256000000)
+  // TODO: fix these...
+  const tmclk clkArr[numfreqs] = {{16, 1875}, {29, 2466}, {32, 1875}, {89, 3784}, {64, 1875}, {147, 3125}, {4, 85}, {32, 625}, {205, 2179}, {8, 85}, {64, 625}, {89, 473}, {16, 85}, {128, 625} };
 #endif
 
   for (int f = 0; f < numfreqs; f++) {

output_i2s.cpp

   #define MCLK_MULT 1
   #define MCLK_DIV  17
 #elif F_CPU == 216000000
-  #define MCLK_MULT 8
-  #define MCLK_DIV  153
-  #define MCLK_SRC  0
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 240000000
-  #define MCLK_MULT 4
+  #define MCLK_MULT 2
   #define MCLK_DIV  85
+  #define MCLK_SRC  0
+#elif F_CPU == 256000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 16000000
   #define MCLK_MULT 12
   #define MCLK_DIV  17

output_i2s_quad.cpp

   #define MCLK_MULT 1
   #define MCLK_DIV  17
 #elif F_CPU == 216000000
-  #define MCLK_MULT 8
-  #define MCLK_DIV  153
-  #define MCLK_SRC  0
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 240000000
-  #define MCLK_MULT 4
+  #define MCLK_MULT 2
   #define MCLK_DIV  85
+  #define MCLK_SRC  0
+#elif F_CPU == 256000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 16000000
   #define MCLK_MULT 12
   #define MCLK_DIV  17

output_pt8211.cpp

   #define MCLK_MULT 1
   #define MCLK_DIV  17
 #elif F_CPU == 216000000
-  #define MCLK_MULT 8
-  #define MCLK_DIV  153
-  #define MCLK_SRC  0
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 240000000
-  #define MCLK_MULT 4
+  #define MCLK_MULT 2
   #define MCLK_DIV  85
+  #define MCLK_SRC  0
+#elif F_CPU == 256000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 16000000
   #define MCLK_MULT 12
   #define MCLK_DIV  17

output_spdif.cpp

   #define MCLK_MULT 1
   #define MCLK_DIV  17
 #elif F_CPU == 216000000
-  #define MCLK_MULT 8
-  #define MCLK_DIV  153
-  #define MCLK_SRC  0
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 240000000
-  #define MCLK_MULT 4
+  #define MCLK_MULT 2
   #define MCLK_DIV  85
+  #define MCLK_SRC  0
+#elif F_CPU == 256000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 16000000
   #define MCLK_MULT 12
   #define MCLK_DIV  17

output_tdm.cpp

   #define MCLK_MULT 2
   #define MCLK_DIV  17
 #elif F_CPU == 216000000
-  #define MCLK_MULT 16
-  #define MCLK_DIV  153
-  #define MCLK_SRC  0
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #elif F_CPU == 240000000
-  #define MCLK_MULT 8
+  #define MCLK_MULT 2
   #define MCLK_DIV  85
+  #define MCLK_SRC  0
+#elif F_CPU == 256000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+  #define MCLK_SRC  1
 #else
   #error "This CPU Clock Speed is not supported by the Audio library";
 #endif