How can I restore the El Capitan Messages notification sound (chime) to the old sound? I've noticed when I receive messages in the Messages app in El Capitan, it plays the "Chime" sound from iOS 9.  

I recall that in the previous version of OSX, or perhaps the one before it, the incoming Messages notification sound was simply a different pitched variant of the "send" message sound. 

How can I restore it to the original Messages sound from the older versions of OSX?
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Mine's always just gone 'ping' so I don't know precisely which sound you mean