diff --git a/README.md b/README.md
index ab7373023a..613bdcf42b 100644
--- a/README.md
+++ b/README.md
@@ -16,13 +16,21 @@ The documentation below explains QMK customizations and elaborates on some of th
 * If you're looking to customize a keyboard that currently runs QMK or TMK, find your keyboard's directory under `keyboard/` and run the make commands from there.
 * If you're looking to apply this firmware to an entirely new hardware project (a new kind of keyboard), you can create your own Quantum-based project by using `./new_project.sh <project_name>`, which will create `/keyboard/<project_name>` with all the necessary components for a Quantum project.
 
+### Makefile Options
+
 You have access to a bunch of goodies! Check out the Makefile to enable/disable some of the features. Uncomment the `#` to enable them. Setting them to `no` does nothing and will only confuse future you.
 
     BACKLIGHT_ENABLE = yes # Enable keyboard backlight functionality
     MIDI_ENABLE = yes      # MIDI controls
-    # UNICODE_ENABLE = yes # Unicode support - this is commented out, just as an example. You have to use #, not //
+    UNICODE_ENABLE = no    # <-- This is how you disable an option, just set it to "no"
     BLUETOOTH_ENABLE = yes # Enable Bluetooth with the Adafruit EZ-Key HID
 
+### Customizing Makefile options on a per-keymap basis
+
+If your keymap directory has a file called `makefile.mk` (note the lowercase filename, and the `.mk` extension), any Makefile options you set in that file will take precedence over other Makefile options (those set for Quantum as a whole or for your particular keyboard).
+
+So let's say your keyboard's makefile has `CONSOLE_ENABLE = yes` (or maybe doesn't even list the `CONSOLE_ENABLE` option, which would cause it to revert to the global Quantum default). You want your particular keymap to not have the debug console, so you make a file called `makefile.mk` and specify `CONSOLE_ENABLE = no`.
+
 ## Quick aliases to common actions
 
 Your keymap can include shortcuts to common operations (called "function actions" in tmk).
@@ -199,6 +207,10 @@ This will clear all mods currently pressed.
 
 This will clear all keys besides the mods currently pressed.
 
+* `update_tri_layer(layer_1, layer_2, layer_3);`
+
+If the user attempts to activate layer 1 AND layer 2 at the same time (for example, by hitting their respective layer keys), layer 3 will be activated. Layers 1 and 2 will _also_ be activated, for the purposes of fallbacks (so a given key will fall back from 3 to 2, to 1 -- and only then to 0).
+
 #### Timer functionality
 
 It's possible to start timers and read values for time-specific events - here's an example:
diff --git a/keyboard/planck/Makefile b/keyboard/planck/Makefile
index ae637fc295..8d4e7787a6 100644
--- a/keyboard/planck/Makefile
+++ b/keyboard/planck/Makefile
@@ -41,7 +41,6 @@
 # Target file name (without extension).
 TARGET = planck
 
-
 # Directory common source filess exist
 TOP_DIR = ../..
 TMK_DIR = ../../tmk_core
@@ -62,17 +61,28 @@ ifneq ("$(wildcard keymaps/$(KEYMAP).c)","")
 else
 ifneq ("$(wildcard keymaps/$(KEYMAP)/keymap.c)","")
 	KEYMAP_FILE = keymaps/$(KEYMAP)/keymap.c
+ifneq ("$(wildcard keymaps/$(KEYMAP)/makefile.mk)","")
+	include keymaps/$(KEYMAP)/makefile.mk
+endif
 else
 $(error Keymap file does not exist)
+endif 
 endif
-endif
+
 else
+
 ifneq ("$(wildcard keymaps/default.c)","")
 	KEYMAP_FILE = keymaps/default.c
 else
 	KEYMAP_FILE = keymaps/default/keymap.c
 endif
+
+ifneq ("$(wildcard keymaps/default/makefile.mk)","")
+	include keymaps/default/makefile.mk
 endif
+
+endif
+
 SRC := $(KEYMAP_FILE) $(SRC)
 
 CONFIG_H = config.h
@@ -94,7 +104,6 @@ MCU = atmega32u4
 #     software delays.
 F_CPU = 16000000
 
-
 #
 # LUFA specific
 #
@@ -126,31 +135,45 @@ OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
 #   USBaspLoader     2048
 OPT_DEFS += -DBOOTLOADER_SIZE=4096
 
-
 # Build Options
-#   comment out to disable the options.
+#   change to "no" to disable the options, or define them in the makefile.mk in 
+#   the appropriate keymap folder that will get included automatically
 #
 BOOTMAGIC_ENABLE = yes      # Virtual DIP switch configuration(+1000)
 MOUSEKEY_ENABLE = yes       # Mouse keys(+4700)
 EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
 CONSOLE_ENABLE = yes        # Console for debug(+400)
 COMMAND_ENABLE = yes        # Commands for debug and configuration
-# NKRO_ENABLE = yes         # USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
 BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
-# MIDI_ENABLE = yes         # MIDI controls
-# AUDIO_ENABLE = yes        # Audio output on port C6
-# UNICODE_ENABLE = yes      # Unicode
-# BLUETOOTH_ENABLE = ye     # Enable Bluetooth with the Adafruit EZ-Key HID
-# RGBLIGHT_ENABLE = yes     # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
+MIDI_ENABLE = no            # MIDI controls
+AUDIO_ENABLE = no           # Audio output on port C6
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-#SLEEP_LED_ENABLE = yes    # Breathing sleep LED during USB suspend
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
+ifdef KEYMAP
 
-ifdef BACKLIGHT_ENABLE
-	SRC += backlight.c
+ifeq ("$(wildcard keymaps/$(KEYMAP).c)","")
+ifneq ("$(wildcard keymaps/$(KEYMAP)/makefile.mk)","")
+	include keymaps/$(KEYMAP)/makefile.mk
+endif 
 endif
 
+else
+
+ifneq ("$(wildcard keymaps/default/makefile.mk)","")
+	include keymaps/default/makefile.mk
+endif
+
+endif
+
+ifeq ($(strip $(BACKLIGHT_ENABLE)), yes)
+	SRC := backlight.c $(SRC)
+endif
 
 # Optimize size but this may cause error "relocation truncated to fit"
 #EXTRALDFLAGS = -Wl,--relax
diff --git a/keyboard/planck/config.h b/keyboard/planck/config.h
index d3719e0cb1..7d64f09773 100644
--- a/keyboard/planck/config.h
+++ b/keyboard/planck/config.h
@@ -73,10 +73,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /* disable debug print */
-#define NO_DEBUG
+//#define NO_DEBUG
 
 /* disable print */
-#define NO_PRINT
+//#define NO_PRINT
 
 /* disable action features */
 //#define NO_ACTION_LAYER
diff --git a/keyboard/planck/keymaps/default/keymap.c b/keyboard/planck/keymaps/default/keymap.c
index 30ad877605..56092d04fb 100644
--- a/keyboard/planck/keymaps/default/keymap.c
+++ b/keyboard/planck/keymaps/default/keymap.c
@@ -2,8 +2,9 @@
 // this is the style you want to emulate.
 
 #include "planck.h"
-#ifdef BACKLIGHT_ENABLE
-  #include "backlight.h"
+#include "action_layer.h"
+#ifdef AUDIO_ENABLE
+  #include "audio.h"
 #endif
 
 // Each layer gets a name for readability, which is then used in the keymap matrix below.
@@ -15,6 +16,15 @@
 #define _DV 2
 #define _LW 3
 #define _RS 4
+#define _AD 5
+
+// Macro name shortcuts
+#define M_QW 0
+#define M_CM 1
+#define M_DV 2
+#define M_LW 3
+#define M_RS 4
+#define M_BL 5
 
 // Fillers to make layering more clear
 #define _______ KC_TRNS
@@ -37,7 +47,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   {KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC},
   {KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT},
   {KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT },
-  {M(0),    KC_LCTL, KC_LALT, KC_LGUI, MO(_LW), KC_SPC,  KC_SPC,  MO(_RS), KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
+  {M(M_BL), KC_LCTL, KC_LALT, KC_LGUI, M(M_LW), KC_SPC,  KC_SPC,  M(M_RS), KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
 },
 
 /* Colemak
@@ -55,7 +65,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   {KC_TAB,  KC_Q,    KC_W,    KC_F,    KC_P,    KC_G,    KC_J,    KC_L,    KC_U,    KC_Y,    KC_SCLN, KC_BSPC},
   {KC_ESC,  KC_A,    KC_R,    KC_S,    KC_T,    KC_D,    KC_H,    KC_N,    KC_E,    KC_I,    KC_O,    KC_QUOT},
   {KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_K,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT },
-  {M(0),    KC_LCTL, KC_LALT, KC_LGUI, MO(_LW), KC_SPC,  KC_SPC,  MO(_RS), KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
+  {M(M_BL), KC_LCTL, KC_LALT, KC_LGUI, M(M_LW), KC_SPC,  KC_SPC,  M(M_RS), KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
 },
 
 /* Dvorak
@@ -73,43 +83,61 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   {KC_TAB,  KC_QUOT, KC_COMM, KC_DOT,  KC_P,    KC_Y,    KC_F,    KC_G,    KC_C,    KC_R,    KC_L,    KC_BSPC},
   {KC_ESC,  KC_A,    KC_O,    KC_E,    KC_U,    KC_I,    KC_D,    KC_H,    KC_T,    KC_N,    KC_S,    KC_SLSH},
   {KC_LSFT, KC_SCLN, KC_Q,    KC_J,    KC_K,    KC_X,    KC_B,    KC_M,    KC_W,    KC_V,    KC_Z,    KC_ENT },
-  {M(0),    KC_LCTL, KC_LALT, KC_LGUI, MO(_LW), KC_SPC,  KC_SPC,  MO(_RS), KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
-},
-
-/* Raise
- * ,-----------------------------------------------------------------------------------.
- * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
- * |------+------+------+------+------+-------------+------+------+------+------+------|
- * | Esc  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   =  |   [  |   ]  |  \   |
- * |------+------+------+------+------+------|------+------+------+------+------+------|
- * | Shift|  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |Qwerty|Colemk|Dvorak| Reset|Enter |
- * |------+------+------+------+------+------+------+------+------+------+------+------|
- * | Brite| Ctrl | Alt  | GUI  |Lower |    Space    |Raise | Next | Vol- | Vol+ | Play |
- * `-----------------------------------------------------------------------------------'
- */
-[_RS] = {
-  {KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC},
-  {_______, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS},
-  {_______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  DF(_QW), DF(_CM), DF(_DV), RESET,   _______},
-  {_______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
+  {M(M_BL), KC_LCTL, KC_LALT, KC_LGUI, M(M_LW), KC_SPC,  KC_SPC,  M(M_RS), KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT}
 },
 
 /* Lower
  * ,-----------------------------------------------------------------------------------.
  * |   ~  |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  | Bksp |
  * |------+------+------+------+------+-------------+------+------+------+------+------|
- * | Esc  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |  |   |
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |  |   |
  * |------+------+------+------+------+------|------+------+------+------+------+------|
- * | Shift|  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |Qwerty|Colemk|Dvorak| Reset|Enter |
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |      |      |      |      |Enter |
  * |------+------+------+------+------+------+------+------+------+------+------+------|
- * | Brite| Ctrl | Alt  | GUI  |Lower |    Space    |Raise | Next | Vol- | Vol+ | Play |
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
  * `-----------------------------------------------------------------------------------'
  */
 [_LW] = {
   {KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC},
-  {_______, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE},
-  {_______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  DF(_QW), DF(_CM), DF(_DV), RESET,   _______},
+  {KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE},
+  {_______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  _______, _______, _______, _______, _______},
   {_______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
+},
+
+/* Raise
+ * ,-----------------------------------------------------------------------------------.
+ * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   =  |   [  |   ]  |  \   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |      |      |      |      |Enter |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_RS] = {
+  {KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC},
+  {KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS},
+  {_______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  _______, _______, _______, _______, _______},
+  {_______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY}
+},
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------------------------------------------------.
+ * |      | Reset|      |      |      |      |      |      |      |      |      |  Del |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |      |      |      |      |      |      |Qwerty|Colemk|Dvorak|      |      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |      |      |      |      |      |      |      |      |      |      |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      |      |      |      |      |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_AD] = {
+  {_______, RESET,   _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_DEL},
+  {_______, _______, _______, _______, _______, _______, _______, M(M_QW), M(M_CM), M(M_DV), _______, _______},
+  {_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______},
+  {_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______}
 }
 };
 
@@ -117,11 +145,83 @@ const uint16_t PROGMEM fn_actions[] = {
 
 };
 
+#ifdef AUDIO_ENABLE
+float tone_qw[][2] = {
+  {440.0*pow(2.0,(59)/12.0), 8},
+  {440.0*pow(2.0,(60)/12.0), 8},
+  {0, 4},
+  {440.0*pow(2.0,(67)/12.0), 16}
+};
+
+float tone_cm[][2] = {
+  {440.0*pow(2.0,(59)/12.0), 8},
+  {440.0*pow(2.0,(60)/12.0), 8},
+  {0, 4},
+  {440.0*pow(2.0,(67)/12.0), 16},
+  {0, 4},
+  {440.0*pow(2.0,(71)/12.0), 16}
+};
+
+float tone_dv[][2] = {
+  {440.0*pow(2.0,(59)/12.0), 8},
+  {440.0*pow(2.0,(60)/12.0), 8},
+  {0, 4},
+  {440.0*pow(2.0,(67)/12.0), 16},
+  {0, 4},
+  {440.0*pow(2.0,(69)/12.0), 16},
+  {0, 4},
+  {440.0*pow(2.0,(67)/12.0), 16}
+};
+#endif
+
+
 const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
 {
   // MACRODOWN only works in this function
       switch(id) {
-        case 0:
+        case M_QW:
+          if (record->event.pressed) {
+            #ifdef AUDIO_ENABLE
+              play_notes(&tone_qw, 4, false);
+            #endif
+            default_layer_set(1UL<<_QW);
+          }
+          break;
+        case M_CM:
+          if (record->event.pressed) {
+            #ifdef AUDIO_ENABLE
+              play_notes(&tone_cm, 6, false);
+            #endif
+            default_layer_set(1UL<<_CM);
+          }
+          break;
+        case M_DV:
+          if (record->event.pressed) {
+            #ifdef AUDIO_ENABLE
+              play_notes(&tone_dv, 8, false);
+            #endif
+            default_layer_set(1UL<<_DV);
+          }
+          break;
+        case M_LW:
+          if (record->event.pressed) {
+            layer_on(_LW);
+            update_tri_layer(_LW, _RS, _AD);
+          } else {
+            layer_off(_LW);
+            update_tri_layer(_LW, _RS, _AD);
+          }
+          break;
+        case M_RS:
+          if (record->event.pressed) {
+            layer_on(_RS);
+            update_tri_layer(_LW, _RS, _AD);
+          } else {
+            layer_off(_RS);
+            update_tri_layer(_LW, _RS, _AD);
+          }
+          break;
+        case M_BL:
           if (record->event.pressed) {
             register_code(KC_RSFT);
             #ifdef BACKLIGHT_ENABLE
@@ -134,3 +234,20 @@ const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
       }
     return MACRO_NONE;
 };
+
+#ifdef AUDIO_ENABLE
+float start_up[][2] = {
+  {440.0*pow(2.0,(67)/12.0), 12},
+  {440.0*pow(2.0,(64)/12.0), 8},
+  {440.0*pow(2.0,(55)/12.0), 8},
+  {440.0*pow(2.0,(60)/12.0), 8},
+  {440.0*pow(2.0,(64)/12.0), 20}
+};
+#endif
+
+void matrix_init_user(void) {
+  #ifdef AUDIO_ENABLE
+    init_notes();
+    play_notes(&start_up, 5, false);
+  #endif
+}
diff --git a/keyboard/planck/keymaps/default/makefile.mk b/keyboard/planck/keymaps/default/makefile.mk
new file mode 100644
index 0000000000..8cbec4a1f5
--- /dev/null
+++ b/keyboard/planck/keymaps/default/makefile.mk
@@ -0,0 +1 @@
+AUDIO_ENABLE = yes 
\ No newline at end of file
diff --git a/quantum/audio.c b/quantum/audio.c
index f29d941d7c..50e5505fe0 100644
--- a/quantum/audio.c
+++ b/quantum/audio.c
@@ -255,7 +255,12 @@ ISR(TIMER3_COMPA_vect) {
 
 
         note_position++;
-        if (note_position >= note_length) {
+        bool end_of_note = false;
+        if (ICR3 > 0) 
+            end_of_note = (note_position >= (note_length / ICR3 * 0xFFFF));
+        else 
+            end_of_note = (note_position >= (note_length * 0x7FF));
+        if (end_of_note) {
             current_note++;
             if (current_note >= notes_length) {
                 if (notes_repeat) {
diff --git a/quantum/keymap_common.c b/quantum/keymap_common.c
index ae6cddb343..3a00d36f08 100644
--- a/quantum/keymap_common.c
+++ b/quantum/keymap_common.c
@@ -33,11 +33,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     #include "audio.h"
 
     float goodbye[][2] = {
-        {440.0*pow(2.0,(67)/12.0), 400},
-        {0, 50},
-        {440.0*pow(2.0,(60)/12.0), 400},
-        {0, 50},
-        {440.0*pow(2.0,(55)/12.0), 600},
+        {440.0*pow(2.0,(67)/12.0), 8},
+        {440.0*pow(2.0,(60)/12.0), 8},
+        {440.0*pow(2.0,(55)/12.0), 12},
     };
 #endif
 
@@ -90,7 +88,7 @@ action_t action_for_key(uint8_t layer, keypos_t key)
     	action_t action;
         clear_keyboard();
         #ifdef AUDIO_ENABLE
-            play_notes(&goodbye, 5, false);
+            play_notes(&goodbye, 3, false);
         #endif
         _delay_ms(250);
         #ifdef ATREUS_ASTAR
@@ -293,3 +291,11 @@ action_t keymap_func_to_action(uint16_t keycode)
 	// For FUNC without 8bit limit
     return (action_t){ .code = pgm_read_word(&fn_actions[(int)keycode]) };
 }
+
+void update_tri_layer(uint8_t layer1, uint8_t layer2, uint8_t layer3) {
+  if (IS_LAYER_ON(layer1) && IS_LAYER_ON(layer2)) {
+    layer_on(layer3);
+  } else {
+    layer_off(layer3);
+  }
+}
diff --git a/quantum/keymap_common.h b/quantum/keymap_common.h
index 4a877d2a70..7452a1ff3f 100644
--- a/quantum/keymap_common.h
+++ b/quantum/keymap_common.h
@@ -208,5 +208,9 @@ extern const uint16_t fn_actions[];
 #define UNICODE(n) (n | 0x8000)
 #define UC(n) UNICODE(n)
 
+// For tri-layer
+void update_tri_layer(uint8_t layer1, uint8_t layer2, uint8_t layer3);
+#define IS_LAYER_ON(layer)  ((layer_state) & (1UL<<(layer)))
+#define IS_LAYER_OFF(layer) ((!layer_state) & (1UL<<(layer)))
 
 #endif
diff --git a/quantum/quantum.mk b/quantum/quantum.mk
index de93af7e8c..17bb501718 100644
--- a/quantum/quantum.mk
+++ b/quantum/quantum.mk
@@ -23,19 +23,19 @@ ifndef CUSTOM_MATRIX
 	SRC += $(QUANTUM_DIR)/matrix.c
 endif
 
-ifdef MIDI_ENABLE
+ifeq ($(strip $(MIDI_ENABLE)), yes)
 	SRC += $(QUANTUM_DIR)/keymap_midi.c
 endif
 
-ifdef AUDIO_ENABLE
+ifeq ($(strip $(AUDIO_ENABLE)), yes)
 	SRC += $(QUANTUM_DIR)/audio.c
 endif
 
-ifdef UNICODE_ENABLE
+ifeq ($(strip $(UNICODE_ENABLE)), yes)
 	SRC += $(QUANTUM_DIR)/keymap_unicode.c
 endif
 
-ifdef RGBLIGHT_ENABLE
+ifeq ($(strip $(RGBLIGHT_ENABLE)), yes)
 	SRC += $(QUANTUM_DIR)/light_ws2812.c
 	SRC += $(QUANTUM_DIR)/rgblight.c
 	OPT_DEFS += -DRGBLIGHT_ENABLE
diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 89c366f554..f8006c6708 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -17,66 +17,67 @@ SRC +=	$(COMMON_DIR)/host.c \
 
 
 # Option modules
-ifdef BOOTMAGIC_ENABLE
+ifeq ($(strip $(BOOTMAGIC_ENABLE)), yes)
     SRC += $(COMMON_DIR)/bootmagic.c
     SRC += $(COMMON_DIR)/avr/eeconfig.c
     OPT_DEFS += -DBOOTMAGIC_ENABLE
 endif
 
-ifdef MOUSEKEY_ENABLE
+ifeq ($(strip $(MOUSEKEY_ENABLE)), yes)
     SRC += $(COMMON_DIR)/mousekey.c
     OPT_DEFS += -DMOUSEKEY_ENABLE
     OPT_DEFS += -DMOUSE_ENABLE
 endif
 
-ifdef EXTRAKEY_ENABLE
+ifeq ($(strip $(EXTRAKEY_ENABLE)), yes)
     OPT_DEFS += -DEXTRAKEY_ENABLE
 endif
 
-ifdef CONSOLE_ENABLE
+ifeq ($(strip $(CONSOLE_ENABLE)), yes)
     OPT_DEFS += -DCONSOLE_ENABLE
 else
     OPT_DEFS += -DNO_PRINT
     OPT_DEFS += -DNO_DEBUG
 endif
 
-ifdef COMMAND_ENABLE
+ifeq ($(strip $(COMMAND_ENABLE)), yes)
     SRC += $(COMMON_DIR)/command.c
     OPT_DEFS += -DCOMMAND_ENABLE
 endif
 
-ifdef NKRO_ENABLE
+ifeq ($(strip $(NKRO_ENABLE)), yes)
     OPT_DEFS += -DNKRO_ENABLE
 endif
 
-ifdef MIDI_ENABLE
+ifeq ($(strip $(MIDI_ENABLE)), yes)
     OPT_DEFS += -DMIDI_ENABLE
 endif
 
-ifdef AUDIO_ENABLE
+ifeq ($(strip $(AUDIO_ENABLE)), yes)
     OPT_DEFS += -DAUDIO_ENABLE
 endif
 
-ifdef USB_6KRO_ENABLE
+ifeq ($(strip $(USB_6KRO_ENABLE)), yes)
     OPT_DEFS += -DUSB_6KRO_ENABLE
 endif
 
-ifdef SLEEP_LED_ENABLE
+ifeq ($(strip $(SLEEP_LED_ENABLE)), yes)
     SRC += $(COMMON_DIR)/sleep_led.c
     OPT_DEFS += -DSLEEP_LED_ENABLE
     OPT_DEFS += -DNO_SUSPEND_POWER_DOWN
 endif
 
-ifdef BACKLIGHT_ENABLE
+ifeq ($(strip $(BACKLIGHT_ENABLE)), yes)
     SRC += $(COMMON_DIR)/backlight.c
+    SRC += $(COMMON_DIR)/avr/eeconfig.c
     OPT_DEFS += -DBACKLIGHT_ENABLE
 endif
 
-ifdef BLUETOOTH_ENABLE
+ifeq ($(strip $(BLUETOOTH_ENABLE)), yes)
     OPT_DEFS += -DBLUETOOTH_ENABLE
 endif
 
-ifdef KEYMAP_SECTION_ENABLE
+ifeq ($(strip $(KEYMAP_SECTION_ENABLE)), yes)
     OPT_DEFS += -DKEYMAP_SECTION_ENABLE
 
     ifeq ($(strip $(MCU)),atmega32u2)
diff --git a/tmk_core/protocol/lufa.mk b/tmk_core/protocol/lufa.mk
index 4905760bb4..9ac6298f11 100644
--- a/tmk_core/protocol/lufa.mk
+++ b/tmk_core/protocol/lufa.mk
@@ -17,7 +17,7 @@ LUFA_SRC = $(LUFA_DIR)/lufa.c \
 	   $(LUFA_DIR)/descriptor.c \
 	   $(LUFA_SRC_USB)
 
-ifdef MIDI_ENABLE
+ifeq ($(strip $(MIDI_ENABLE)), yes)
 	LUFA_SRC += $(LUFA_DIR)/midi/midi.c \
 	   $(LUFA_DIR)/midi/midi_device.c \
 	   $(LUFA_DIR)/midi/bytequeue/bytequeue.c \
@@ -25,7 +25,7 @@ ifdef MIDI_ENABLE
 	   $(LUFA_SRC_USBCLASS)
 endif
 
-ifdef BLUETOOTH_ENABLE
+ifeq ($(strip $(BLUETOOTH_ENABLE)), yes)
 	LUFA_SRC += $(LUFA_DIR)/bluetooth.c \
 	$(TMK_DIR)/protocol/serial_uart.c
 endif