diff --git a/behaviors/mouse.dtsi b/behaviors/mouse.dtsi
index 971f628..d8713d8 100644
--- a/behaviors/mouse.dtsi
+++ b/behaviors/mouse.dtsi
@@ -45,6 +45,14 @@ ZMK_BEHAVIOR(mwh_tg, macro, bindings =
   <&kp KP_NUMLOCK &kp KP_NUMLOCK>;
 )
 
+
+// Switch move/scroll on Ploopy Nano by pressing NumLock twice
+ZMK_BEHAVIOR(synth_test, macro, bindings =
+  <&macro_tap_time 1>,
+  <&macro_wait_time 18>,
+  <&kp A &kp A>;
+)
+
 // Mouse Left Click - Index and Middle finger of left hand, active on all layers
 ZMK_COMBO(leftclick, &mkp LCLK, LT1 LT2, QWE COL ERG)
 
diff --git a/config/urchin.keymap b/config/urchin.keymap
index 7b10edc..c008fee 100644
--- a/config/urchin.keymap
+++ b/config/urchin.keymap
@@ -104,7 +104,7 @@ ZMK_LAYER(Symbols,
 
 ZMK_LAYER(Nav,
 // ╭───────────┬───────────┬───────────┬────────────┬────────────╮ ╭───────────┬─────────────┬─────────────┬────────────┬────────────╮
-    &out OUT_TOG XXX         XXX         XXX          &bt BT_CLR     XXX         XXX           XXX           XXX          XXX
+    &out OUT_TOG XXX         XXX         XXX          &bt BT_CLR     XXX         XXX           XXX           XXX          &synth_test
 // ├───────────┼───────────┼───────────┼────────────┼────────────┤ ├───────────┼─────────────┼─────────────┼────────────┼────────────┤
      &sk LGUI    &kp C_PREV  &kp C_PP    &kp C_NEXT   XXX            &kp LEFT    &kp DOWN      &kp UP        &kp RIGHT    &kp INS
 // ├───────────┼───────────┼───────────┼────────────┼────────────┤ ├───────────┼─────────────┼─────────────┼────────────┼────────────┤