diff --git a/docs/custom_quantum_functions.md b/docs/custom_quantum_functions.md
index 494e76996e2e..b0ed0f588da1 100644
--- a/docs/custom_quantum_functions.md
+++ b/docs/custom_quantum_functions.md
@@ -148,8 +148,8 @@ This is useful for setting up stuff that you may need elsewhere, but isn't hardw
 
 * GPIO pin initialisation: `void matrix_init_pins(void)`
   * This needs to perform the low-level initialisation of all row and column pins. By default this will initialise the input/output state of each of the GPIO pins listed in `MATRIX_ROW_PINS` and `MATRIX_COL_PINS`, based on whether or not the keyboard is set up for `ROW2COL`, `COL2ROW`, or `DIRECT_PINS`. Should the keyboard designer override this function, no initialisation of pin state will occur within QMK itself, instead deferring to the keyboard's override.
-* `COL2ROW`-based row reads: `void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)`
-* `ROW2COL`-based column reads: `void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)`
+* `COL2ROW`-based row reads: `void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)`
+* `ROW2COL`-based column reads: `void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)`
 * `DIRECT_PINS`-based reads: `void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)`
   * These three functions need to perform the low-level retrieval of matrix state of relevant input pins, based on the matrix type. Only one of the functions should be implemented, if needed. By default this will iterate through `MATRIX_ROW_PINS` and `MATRIX_COL_PINS`, configuring the inputs and outputs based on whether or not the keyboard is set up for `ROW2COL`, `COL2ROW`, or `DIRECT_PINS`. Should the keyboard designer override this function, no manipulation of matrix GPIO pin state will occur within QMK itself, instead deferring to the keyboard's override.
 
diff --git a/keyboards/rgbkb/mun/keymaps/xulkal2/keymap.c b/keyboards/rgbkb/mun/keymaps/xulkal2/keymap.c
index 2de5888f1777..cd1eec751582 100644
--- a/keyboards/rgbkb/mun/keymaps/xulkal2/keymap.c
+++ b/keyboards/rgbkb/mun/keymaps/xulkal2/keymap.c
@@ -159,6 +159,8 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     }
 }
 
+//#define MATRIX_SCAN_DEBUG
+#if !defined(MATRIX_SCAN_DEBUG)
 static void render_layer(void) {
     // Host Keyboard Layer Status
     oled_write_P(PSTR("Layer"), false);
@@ -190,8 +192,8 @@ static void render_touch(void)
     oled_write_P(!touch_encoder_toggled() ? PSTR("TOUCH")  : PSTR("     "), false);
     oled_write_P(touch_encoder_calibrating() ? PSTR("CLBRT")  : PSTR("     "), false);
 }
-
-/*static uint32_t scan_counter = 0;
+#else
+static uint32_t scan_counter = 0;
 static uint32_t scan_value = 0;
 static uint16_t scan_timer = 1000;
 
@@ -218,27 +220,27 @@ void render_debug_scan(void) {
     static char buffer[6] = {0};
     snprintf(buffer, sizeof(buffer), "%5d", scan_value);
     oled_write_ln_P(buffer, false);
-}*/
+}
+#endif
 
 void oled_task_user(void) {
+#if !defined(MATRIX_SCAN_DEBUG)
     if (is_keyboard_left()) {
         render_layer();
         oled_write_P(PSTR("     "), false);
         render_leds();
         oled_write_P(PSTR("     "), false);
         render_touch();
-        //oled_write_P(PSTR("     "), false);
-        //render_debug_scan();
-        oled_set_cursor(0, 12);
-        render_icon();
     }
     else {
         render_rgb_menu();
-        //oled_write_P(PSTR("     "), false);
-        //render_debug_scan();
-        oled_set_cursor(0, 12);
-        render_icon();
     }
+#else
+    oled_write_P(PSTR("     "), false);
+    render_debug_scan();
+#endif
+    oled_set_cursor(0, 12);
+    render_icon();
 }
 
 oled_rotation_t oled_init_user(oled_rotation_t rotation) {
diff --git a/keyboards/rgbkb/mun/keymaps/xulkal2/rules.mk b/keyboards/rgbkb/mun/keymaps/xulkal2/rules.mk
index e35ec125e603..a087f669da47 100644
--- a/keyboards/rgbkb/mun/keymaps/xulkal2/rules.mk
+++ b/keyboards/rgbkb/mun/keymaps/xulkal2/rules.mk
@@ -1,4 +1,3 @@
 MOUSEKEY_ENABLE = yes	# using for mouse wheel up and down, more granular than page up/down
 
-OPT_DEFS += -DRGB_UNLIMITED_POWER
-#DEBOUNCE_TYPE = sym_eager_pk
\ No newline at end of file
+OPT_DEFS += -DRGB_UNLIMITED_POWER
\ No newline at end of file
diff --git a/keyboards/rgbkb/mun/matrix.c b/keyboards/rgbkb/mun/matrix.c
index b859847f10ad..2472d217c75d 100644
--- a/keyboards/rgbkb/mun/matrix.c
+++ b/keyboards/rgbkb/mun/matrix.c
@@ -11,7 +11,19 @@
 #include "atomic_util.h"
 #include "gpio.h"
 
-static pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+#define ROWS_PER_HAND (MATRIX_ROWS / 2)
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS]   = MATRIX_COL_PINS;
+
+void matrix_init_pins(void) {
+    for (size_t i = 0; i < MATRIX_COLS; i++) {
+        setPinInputHigh(col_pins[i]);
+    }
+    for (size_t i = 0; i < ROWS_PER_HAND; i++) {
+        setPinOutput(row_pins[i]);
+        writePinHigh(row_pins[i]);
+    }
+}
 
 void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
     /* Drive row pin low. */
@@ -22,15 +34,17 @@ void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
     uint16_t porta = palReadPort(GPIOA);
     uint16_t portb = palReadPort(GPIOB);
 
+// clang-format off
     /* Order of pins on the mun is: A0, B11, B0, B10, B12, B2, A8
         Pin is active low, therefore we have to invert the result. */
-    matrix_row_t cols = ~(((porta & (0x1 << 0)) >> 0)      // A0 (0)
-                            | ((portb & (0x1 << 11)) >> 10)  // B11 (1)
-                            | ((portb & (0x1 << 0)) << 2)    // B0 (2)
-                            | ((portb & (0x1 << 10)) >> 7)   // B10 (3)
-                            | ((portb & (0x1 << 12)) >> 8)   // B12 (4)
-                            | ((portb & (0x1 << 2)) << 3)    // B2 (5)
-                            | ((porta & (0x1 << 8)) >> 2));  // A8 (6)
+    matrix_row_t cols = ~(((porta & (0x1 <<  0)) >>  0)   // A0  (0)
+                        | ((portb & (0x1 << 11)) >> 10)   // B11 (1)
+                        | ((portb & (0x1 <<  0)) <<  2)   // B0  (2)
+                        | ((portb & (0x1 << 10)) >>  7)   // B10 (3)
+                        | ((portb & (0x1 << 12)) >>  8)   // B12 (4)
+                        | ((portb & (0x1 <<  2)) <<  3)   // B2  (5)
+                        | ((porta & (0x1 <<  8)) >>  2)); // A8  (6)
+// clang-format on
 
     /* Reverse the order of columns for left hand as the board is flipped. */
     //         if (isLeftHand) {
@@ -50,7 +64,7 @@ void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
     /* Drive row pin high again. */
     ATOMIC_BLOCK_FORCEON { writePinHigh(row_pins[current_row]); }
-    matrix_output_unselect_delay(current_row, row_pins[current_row] != 0);
+    matrix_output_unselect_delay(current_row, cols != 0);
 }
 
 #if defined(BUSY_WAIT)
diff --git a/keyboards/rgbkb/mun/rules.mk b/keyboards/rgbkb/mun/rules.mk
index 145d9d4aa85d..e81196f9ee78 100644
--- a/keyboards/rgbkb/mun/rules.mk
+++ b/keyboards/rgbkb/mun/rules.mk
@@ -39,7 +39,7 @@ OPT = 3
 OPT_DEFS += -DOLED_FONT_H=\"../common/glcdfont.c\"
 OPT_DEFS += -Ikeyboards/rgbkb/common
 
-# matrix optimisations (broken, will fix later)
-#SRC += matrix.c
+# matrix optimisations
+SRC += matrix.c
 
 DEFAULT_FOLDER = rgbkb/mun/rev1