Update index.html

index.html

@@ -296,7 +296,7 @@
         // 최초 등장시에만 bf109mg.ogg 재생
         if (!this.hasPlayedSound) {
             const firstSound = new Audio('bf109mg.ogg');
-            firstSound.volume = 0.5;
+            firstSound.volume = 1.0;
             firstSound.play();
             this.hasPlayedSound = true;
         }