diff --git a/build.yaml b/build.yaml
index 8da0aa2..03bcca0 100644
--- a/build.yaml
+++ b/build.yaml
@@ -4,6 +4,7 @@ include:
   ### CORNE START ###
   - board: nice_nano_v2
     shield: corne_left nice_oled
+    snippet: zmk-usb-logging
     artifact-name: nice_corne_left_oled_rgb
   - board: nice_nano_v2
     shield: corne_right nice_oled
diff --git a/config/corne.conf b/config/corne.conf
index 9b5f327..e42ab1c 100644
--- a/config/corne.conf
+++ b/config/corne.conf
@@ -117,6 +117,14 @@ CONFIG_ZMK_KSCAN_DEBOUNCE_RELEASE_MS=5
 # ref: https://zmk.dev/docs/config/system#hid
 CONFIG_ZMK_HID_CONSUMER_REPORT_USAGES_BASIC=y
 
+### STENO ENGINE (v4 union split-section: both dicts, both halves)
+CONFIG_STENO_ENGINE=y
+CONFIG_STENO_DICT_BOTH=y
+CONFIG_STENO_SPLIT_DICT=y
+CONFIG_STENO_DICT_LEFT_MAX_SIZE=440320
+CONFIG_STENO_DICT_RIGHT_MAX_SIZE=519168
+CONFIG_STENO_SPLIT_TIMEOUT_MS=250
+
 ### DEBUG OPTIONS
 # CONFIG_ZMK_USB_LOGGING=y
 # CONFIG_LOG_PROCESS_THREAD_STARTUP_DELAY_MS=8000
diff --git a/config/corne.keymap b/config/corne.keymap
index 8da5a66..d622148 100644
--- a/config/corne.keymap
+++ b/config/corne.keymap
@@ -13,6 +13,8 @@
 #include <dt-bindings/zmk/backlight.h>
 #include <dt-bindings/zmk/rgb.h>
 #include <dt-bindings/zmk/reset.h>
+#include <behaviors/steno_engine.dtsi>
+#include <dt-bindings/zmk/steno_keys.h>
 #include <dt-bindings/zmk/rgb_colors.h>
 
 &led_strip {
@@ -199,10 +201,10 @@
         steno_layer {
             display-name = "STEN";
             bindings = <
-&none   &none  &none  &none  &none  &none      &none  &none  &none  &none  &none  &to 4
-&mo 4   &none  &none  &none  &none  &none      &none  &none  &none  &none  &none  &none
-&none   &none  &none  &none  &none  &none      &none  &none  &none  &none  &none  &none
-                       &none  &none  &none      &none  &none  &none
+&steno STENO_NUM &steno STENO_SL &steno STENO_TL &steno STENO_PL &steno STENO_HL &steno STENO_STAR      &steno STENO_STAR &steno STENO_FR &steno STENO_PR &steno STENO_LR &steno STENO_TR &steno STENO_DR
+&mo 4            &steno STENO_SL &steno STENO_KL &steno STENO_WL &steno STENO_RL &steno STENO_STAR      &steno STENO_STAR &steno STENO_RR &steno STENO_BR &steno STENO_GR &steno STENO_SR &steno STENO_ZR
+&none            &none           &none           &none           &none           &none                  &none             &none           &none           &none           &none           &to 4
+                                                 &none           &steno STENO_A  &steno STENO_O         &steno STENO_E    &steno STENO_U  &none
             >;
         };
 
diff --git a/config/west.yml b/config/west.yml
index 27c389f..79fe2a0 100644
--- a/config/west.yml
+++ b/config/west.yml
@@ -24,6 +24,10 @@ manifest:
     - name: zmk-rgb-effects
       remote: afiqzudinhadi-zmk
       revision: v1.1.1
+    # Steno engine module (split-dict partition)
+    - name: zmk-steno-engine
+      remote: afiqzudinhadi-zmk
+      revision: split-combined
     # dongle_display
     - name: zmk-dongle-display
       remote: englmaxi
diff --git a/keymap-drawer/corne.svg b/keymap-drawer/corne.svg
index 887c9d8..9a49bb7 100644
--- a/keymap-drawer/corne.svg
+++ b/keymap-drawer/corne.svg
@@ -749,42 +749,75 @@ rect.held, rect.combo.held {
 <g transform="translate(0, 56)">
 <g transform="translate(28, 49)" class="key keypos-0">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 67%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 67%">STENO_NUM</tspan>
+</text>
 </g>
 <g transform="translate(84, 49)" class="key keypos-1">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_SL</tspan>
+</text>
 </g>
 <g transform="translate(140, 35)" class="key keypos-2">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_TL</tspan>
+</text>
 </g>
 <g transform="translate(196, 28)" class="key keypos-3">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_PL</tspan>
+</text>
 </g>
 <g transform="translate(252, 35)" class="key keypos-4">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_HL</tspan>
+</text>
 </g>
 <g transform="translate(308, 42)" class="key keypos-5">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 60%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 60%">STENO_STAR</tspan>
+</text>
 </g>
 <g transform="translate(532, 42)" class="key keypos-6">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 60%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 60%">STENO_STAR</tspan>
+</text>
 </g>
 <g transform="translate(588, 35)" class="key keypos-7">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_FR</tspan>
+</text>
 </g>
 <g transform="translate(644, 28)" class="key keypos-8">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_PR</tspan>
+</text>
 </g>
 <g transform="translate(700, 35)" class="key keypos-9">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_LR</tspan>
+</text>
 </g>
 <g transform="translate(756, 49)" class="key keypos-10">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_TR</tspan>
+</text>
 </g>
 <g transform="translate(812, 49)" class="key keypos-11">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
-<a href="#HUB">
-<text x="0" y="0" class="key tap layer-activator">HUB</text>
-</a><text x="0" y="24" class="key hold">toggle</text>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_DR</tspan>
+</text>
 </g>
 <g transform="translate(28, 105)" class="key keypos-12">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
@@ -793,36 +826,69 @@ rect.held, rect.combo.held {
 </a></g>
 <g transform="translate(84, 105)" class="key keypos-13">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_SL</tspan>
+</text>
 </g>
 <g transform="translate(140, 91)" class="key keypos-14">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_KL</tspan>
+</text>
 </g>
 <g transform="translate(196, 84)" class="key keypos-15">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_WL</tspan>
+</text>
 </g>
 <g transform="translate(252, 91)" class="key keypos-16">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_RL</tspan>
+</text>
 </g>
 <g transform="translate(308, 98)" class="key keypos-17">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 60%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 60%">STENO_STAR</tspan>
+</text>
 </g>
 <g transform="translate(532, 98)" class="key keypos-18">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 60%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 60%">STENO_STAR</tspan>
+</text>
 </g>
 <g transform="translate(588, 91)" class="key keypos-19">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_RR</tspan>
+</text>
 </g>
 <g transform="translate(644, 84)" class="key keypos-20">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_BR</tspan>
+</text>
 </g>
 <g transform="translate(700, 91)" class="key keypos-21">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_GR</tspan>
+</text>
 </g>
 <g transform="translate(756, 105)" class="key keypos-22">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_SR</tspan>
+</text>
 </g>
 <g transform="translate(812, 105)" class="key keypos-23">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 75%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 75%">STENO_ZR</tspan>
+</text>
 </g>
 <g transform="translate(28, 161)" class="key keypos-24">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
@@ -859,21 +925,36 @@ rect.held, rect.combo.held {
 </g>
 <g transform="translate(812, 161)" class="key keypos-35">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<a href="#HUB">
+<text x="0" y="0" class="key tap layer-activator">HUB</text>
+</a><text x="0" y="24" class="key hold">toggle</text>
 </g>
 <g transform="translate(224, 205)" class="key keypos-36">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
 </g>
 <g transform="translate(286, 213) rotate(15.0)" class="key keypos-37">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 86%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 86%">STENO_A</tspan>
+</text>
 </g>
 <g transform="translate(351, 224) rotate(30.0)" class="key keypos-38">
 <rect rx="6" ry="6" x="-26" y="-40" width="52" height="80" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 86%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 86%">STENO_O</tspan>
+</text>
 </g>
 <g transform="translate(489, 224) rotate(-30.0)" class="key keypos-39">
 <rect rx="6" ry="6" x="-26" y="-40" width="52" height="80" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 86%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 86%">STENO_E</tspan>
+</text>
 </g>
 <g transform="translate(554, 213) rotate(-15.0)" class="key keypos-40">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
+<text x="0" y="0" class="key tap">
+<tspan x="0" dy="-0.6em" style="font-size: 86%">&amp;steno</tspan><tspan x="0" dy="1.2em" style="font-size: 86%">STENO_U</tspan>
+</text>
 </g>
 <g transform="translate(616, 205)" class="key keypos-41">
 <rect rx="6" ry="6" x="-26" y="-26" width="52" height="52" class="key"/>
diff --git a/keymap-drawer/corne.yaml b/keymap-drawer/corne.yaml
index 9dffbde..9222e85 100644
--- a/keymap-drawer/corne.yaml
+++ b/keymap-drawer/corne.yaml
@@ -87,6 +87,30 @@ layers:
   - $$mdi:apple-keyboard-option$$
   - {t: MUTE, h: PLAY PAUSE}
   STEN:
+  - '&steno STENO_NUM'
+  - '&steno STENO_SL'
+  - '&steno STENO_TL'
+  - '&steno STENO_PL'
+  - '&steno STENO_HL'
+  - '&steno STENO_STAR'
+  - '&steno STENO_STAR'
+  - '&steno STENO_FR'
+  - '&steno STENO_PR'
+  - '&steno STENO_LR'
+  - '&steno STENO_TR'
+  - '&steno STENO_DR'
+  - HUB
+  - '&steno STENO_SL'
+  - '&steno STENO_KL'
+  - '&steno STENO_WL'
+  - '&steno STENO_RL'
+  - '&steno STENO_STAR'
+  - '&steno STENO_STAR'
+  - '&steno STENO_RR'
+  - '&steno STENO_BR'
+  - '&steno STENO_GR'
+  - '&steno STENO_SR'
+  - '&steno STENO_ZR'
   - ''
   - ''
   - ''
@@ -99,35 +123,11 @@ layers:
   - ''
   - ''
   - {t: HUB, h: toggle}
-  - HUB
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
-  - ''
   - ''
+  - '&steno STENO_A'
+  - '&steno STENO_O'
+  - '&steno STENO_E'
+  - '&steno STENO_U'
   - ''
   FPS:
   - {t: '1', h: Esc}