diff --git a/kmk/boards/nice_nano/crkbd.py b/kmk/boards/nice_nano/crkbd.py
index c73b049..2169f09 100644
--- a/kmk/boards/nice_nano/crkbd.py
+++ b/kmk/boards/nice_nano/crkbd.py
@@ -21,7 +21,6 @@ class KMKKeyboard(_KMKKeyboard):
 
     split_type = 'UART'  # TODO add bluetooth support as well
     split_flip = True
-    split_offsets = [6, 6, 6, 6, 6]
     uart_pin = board.P0_08
     rgb_pixel_pin = board.P0_06
     extra_data_pin = board.SDA  # TODO This is incorrect. Find better solution
@@ -35,5 +34,5 @@ class KMKKeyboard(_KMKKeyboard):
     coord_mapping.extend(ic(3, x) for x in range(3, 9))
 
     layers_ext = Layers()
-    split = Split(uart_pin=uart_pin, split_offsets=split_offsets)
+    split = Split(uart_pin=uart_pin)
     extensions = [layers_ext]
diff --git a/kmk/extensions/__init__.py b/kmk/extensions/__init__.py
index d41bba8..ba76d6a 100644
--- a/kmk/extensions/__init__.py
+++ b/kmk/extensions/__init__.py
@@ -33,6 +33,9 @@ class Extension:
         pass
 
     def after_matrix_scan(self, keyboard, matrix_update):
+        '''
+        Return value will be replace matrix update if supplied
+        '''
         pass
 
     def before_hid_send(self, keyboard):
diff --git a/kmk/extensions/ble_split.py b/kmk/extensions/ble_split.py
index 6047bf6..baac766 100644
--- a/kmk/extensions/ble_split.py
+++ b/kmk/extensions/ble_split.py
@@ -8,15 +8,13 @@ from kmk.matrix import intify_coordinate
 
 
 class BLE_Split(Extension):
-    def __init__(
-        self, split_flip=True, split_side=None, split_offsets=[], hid_type=HIDModes.BLE
-    ):
+    def __init__(self, split_flip=True, split_side=None, hid_type=HIDModes.BLE):
         self._is_target = True
         self._uart_buffer = []
         self.hid_type = hid_type
         self.split_flip = split_flip
         self.split_side = split_side
-        self.split_offsets = split_offsets
+        self.split_offset = None
         self._ble = BLERadio()
         self._ble_last_scan = ticks_ms() - 5000
         self._is_target = True
@@ -30,28 +28,22 @@ class BLE_Split(Extension):
         return f'BLE_SPLIT({self._to_dict()})'
 
     def _to_dict(self):
-        return f'BLE_Split( _ble={self._ble} _ble_last_scan={self._ble_last_scan} _is_target={self._is_target} _uart_buffer={self._uart_buffer} _split_flip={self.split_flip} _split_side={self.split_side} _split_offsets={self.split_offsets} )'
+        return f'BLE_Split( _ble={self._ble} _ble_last_scan={self._ble_last_scan} _is_target={self._is_target} _uart_buffer={self._uart_buffer} _split_flip={self.split_flip} _split_side={self.split_side} )'
 
     def during_bootup(self, keyboard):
-        if self.split_side == 'Left':
-            self._is_target = True
-        else:
-            self._is_target = False
+        self._is_target = bool(self.split_side == 'Left')
 
         if self.split_flip and not self._is_target:
             keyboard.col_pins = list(reversed(keyboard.col_pins))
 
-        self.connect()
+        self.split_offset = len(keyboard.col_pins)
+
         # Attempt to sanely guess a coord_mapping if one is not provided.
-        if not keyboard.coord_mapping or (self.split_flip and not self._is_target):
+        if not keyboard.coord_mapping:
             keyboard.coord_mapping = []
 
-            rows_to_calc = len(keyboard.row_pins)
-            cols_to_calc = len(keyboard.col_pins)
-
-            if self.split_offsets:
-                rows_to_calc *= 2
-                cols_to_calc *= 2
+            rows_to_calc = len(keyboard.row_pins) * 2
+            cols_to_calc = len(keyboard.col_pins) * 2
 
             for ridx in range(rows_to_calc):
                 for cidx in range(cols_to_calc):
@@ -63,7 +55,8 @@ class BLE_Split(Extension):
 
     def after_matrix_scan(self, keyboard_state, matrix_update):
         if matrix_update:
-            self._send(matrix_update)
+            matrix_update = self._send(matrix_update)
+            return matrix_update
 
     def check_all_connections(self):
         self._connection_count = len(self._ble.connections)
@@ -140,7 +133,7 @@ class BLE_Split(Extension):
         if self._uart:
             try:
                 if not self._is_target:
-                    update[1] += self.split_offsets[update[0]]
+                    update[1] += self.split_offset
                 self._uart.write(update)
             except OSError:
                 try:
@@ -150,7 +143,7 @@ class BLE_Split(Extension):
                 print('Connection error')
                 self._uart_connection = None
                 self._uart = None
-        return
+        return update
 
     def _receive(self):
         if self._uart is not None and self._uart.in_waiting > 0 or self._uart_buffer:
@@ -158,14 +151,7 @@ class BLE_Split(Extension):
                 self._uart_buffer.append(self._uart.read(3))
             if self._uart_buffer:
                 update = bytearray(self._uart_buffer.pop(0))
-
                 return update
 
         return None
 
-    def ble_rescan_timer(self):
-        return bool(ticks_diff(ticks_ms(), self.ble_last_scan) > 5000)
-
-    def ble_time_reset(self):
-        self.ble_last_scan = ticks_ms()
-        return self
diff --git a/kmk/extensions/split.py b/kmk/extensions/split.py
index 20d0818..b9059ef 100644
--- a/kmk/extensions/split.py
+++ b/kmk/extensions/split.py
@@ -15,7 +15,7 @@ class Split(Extension):
         self,
         is_target=True,
         extra_data_pin=None,
-        split_offsets=None,
+        split_offset=None,
         split_flip=True,
         split_side=None,
         split_type=SplitType.UART,
@@ -26,7 +26,7 @@ class Split(Extension):
     ):
         self._is_target = is_target
         self.extra_data_pin = extra_data_pin
-        self.split_offsets = split_offsets
+        self.split_offsets = split_offset
         self.split_flip = split_flip
         self.split_side = split_side
         self.split_type = split_type
@@ -66,12 +66,10 @@ class Split(Extension):
         if not keyboard.coord_mapping:
             keyboard.coord_mapping = []
 
-            rows_to_calc = len(keyboard.row_pins)
-            cols_to_calc = len(keyboard.col_pins)
+            self.split_offset = len(keyboard.col_pins)
 
-            if self.split_offsets:
-                rows_to_calc *= 2
-                cols_to_calc *= 2
+            rows_to_calc = len(keyboard.row_pins) * 2
+            cols_to_calc = len(keyboard.col_pins) * 2
 
             for ridx in range(rows_to_calc):
                 for cidx in range(cols_to_calc):
@@ -87,9 +85,9 @@ class Split(Extension):
 
     def _send(self, update):
         if self.split_target_left:
-            update[1] += self.split_offsets[update[0]]
+            update[1] += self.split_offset
         else:
-            update[1] -= self.split_offsets[update[0]]
+            update[1] -= self.split_offsets
         if self._uart is not None:
             self._uart.write(update)
 
diff --git a/kmk/kmk_keyboard.py b/kmk/kmk_keyboard.py
index 793bc29..7c05bd7 100644
--- a/kmk/kmk_keyboard.py
+++ b/kmk/kmk_keyboard.py
@@ -36,6 +36,8 @@ class KMKKeyboard:
     _coord_keys_pressed = {}
     _hid_helper = None
     _hid_pending = False
+    _matrix_update = None
+    _matrix_modify = None
 
     # this should almost always be PREpended to, replaces
     # former use of reversed_active_layers which had pointless
@@ -373,15 +375,21 @@ class KMKKeyboard:
                 except Exception as e:
                     print('Failed to run pre matrix function: ', e)
 
-            matrix_update = self.matrix.scan_for_changes()
-            self._handle_matrix_report(matrix_update)
+            self._matrix_update = self.matrix.scan_for_changes()
 
             for ext in self.extensions:
                 try:
-                    ext.after_matrix_scan(self, matrix_update)
+                    self._matrix_modify = ext.after_matrix_scan(
+                        self, self._matrix_update
+                    )
+                    if self._matrix_modify is not None:
+                        self._matrix_update = self._matrix_modify
                 except Exception as e:
                     print('Failed to run post matrix function: ', e)
 
+            self._handle_matrix_report(self._matrix_update)
+            self._matrix_update = None
+
             for ext in self.extensions:
                 try:
                     ext.before_hid_send(self)
diff --git a/user_keymaps/kdb424/corne.py b/user_keymaps/kdb424/corne.py
index 1c7aafc..501dabc 100644
--- a/user_keymaps/kdb424/corne.py
+++ b/user_keymaps/kdb424/corne.py
@@ -1,5 +1,10 @@
+# OLED
 import board
 
+import adafruit_displayio_ssd1306
+import displayio
+import terminalio
+from adafruit_display_text import label
 from kmk.boards.nice_nano.crkbd import KMKKeyboard
 from kmk.extensions.ble_split import BLE_Split
 from kmk.extensions.rgb import RGB
@@ -22,13 +27,19 @@ keyboard.tap_time = 300
 keyboard.debug_enabled = False
 
 # TODO Get this out of here
-split_offsets = [6, 6, 6, 6]
 rgb_pixel_pin = board.P0_06
 rgb_ext = RGB(pixel_pin=rgb_pixel_pin, num_pixels=27, val_limit=100, hue_default=190, sat_default=100, val_default=5)
 
-split = BLE_Split(split_offsets=split_offsets, split_side=split_side)
+split = BLE_Split(split_side=split_side)
 keyboard.extensions = [split, rgb_ext]
 
+displayio.release_displays()
+i2c = board.I2C()
+display_bus = displayio.I2CDisplay(i2c, device_address=0x3c)
+display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
+splash = displayio.Group(max_size=10)
+display.show(splash)
+
 keyboard.keymap = [
     # DVORAK
     # ,-----------------------------------------.                    ,-----------------------------------------.