allow audio engine to react to keyboard inputs

ui/Main.qml

@@ -30,4 +30,23 @@ ApplicationWindow {
         }
     }
 
+    Item {
+        anchors.fill: parent
+        focus: true
+
+        Keys.onPressed: (event) => {
+            if(!event.isAutoRepeat) {
+                keyboardController.keyDownEvent(event.key, event.modifiers, event.text)
+                event.accepted = true
+            }
+        }
+
+        Keys.onReleased: (event) => {
+            if(!event.isAutoRepeat) {
+                keyboardController.keyUpEvent(event.key, event.modifiers, event.text)
+                event.accepted = true
+            }
+        }
+    }
+
 }