I am a person who loves to customize things to my liking, and I do not like being forced to use things. The sound when you send a message in Messages (that little WOOOOO that goes up in tone) or when you have the chat open and you receive a message (the WOOOO sound going down in tone. Is there any system file I can replace with my own, and have it make that sound when I send or receive message? It would really help me.