Add configurable procedural sounds

index.html

@@ -125,6 +125,7 @@
         <script src="./src/spawn-balls.js"></script>
         <script src="./src/spawn.js"></script>
         <script src="./src/goals.js"></script>
+        <script src="./src/sounds.js"></script>
         <script src="./src/chain-controller.js"></script>
         <script src="./src/loop.js"></script>
         <script src="./src/input.js"></script>