🚸 UI Sound off/on with M300 E<0|1> (MarlinFirmware#26142)

Author: mriscoc

Marlin/src/gcode/lcd/M300.cpp

@@ -34,8 +34,19 @@
  *
  *  S<frequency> - (Hz) The frequency of the tone. 0 for silence.
  *  P<duration>  - (ms) The duration of the tone.
+ *
+ * With SOUND_MENU_ITEM:
+ *  E<0|1>       - Mute or enable sound
  */
 void GcodeSuite::M300() {
+
+  #if ENABLED(SOUND_MENU_ITEM)
+    if (parser.seen('E')) {
+      ui.sound_on = parser.value_bool();
+      return;
+    }
+  #endif
+
   const uint16_t frequency = parser.ushortval('S', 260);
   uint16_t duration = parser.ushortval('P', 1000);