Do not play sounds on initial load.

app/assets/javascripts/app/controllers/chat.coffee

@@ -81,6 +81,9 @@ class App.CustomerChat extends App.Controller
 
     # play on changes
     if @lastWaitingChatCount isnt counter
+
+      # do not play sound on initial load
+      if counter > 0 && @lastWaitingChatCount isnt undefined
         @sounds.chat_new.play()
       @lastWaitingChatCount = counter