I've been having this weird problem with my Radical! where this very percussive sound was appearing to displace a lot of the other audio I was supposed to be hearing in the game.
I've noticed it for a couple of weeks, and it was starting to bug me.
I just now found that it was a drop target switch adjusted too close together causing it to close when nearby objects were hit.
A simple adjustment of the contacts eliminated the problem.
Even the easy ones give you a good feeling of accomplishment. 
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Grayling, MI
Brisbane