[LAU] "ducking" software

Hello,

A friend of mine just sent me this email. I'm drawing a blank, so I
thought I would throw it to the list and see what happens:

--[begin email

He is hosting a shoutcast server with music he's streaming. He
wants to duck his streaming media every 30 seconds and play a
prerecorded file from a directory (think hold music with commercials
playing every 30 seconds).

You have any ideas in mind? Do you know of any software that will do this?

--[end email

Thanks all,

-- 
Josh Lawrence
http://hardbop200.blogspot.com
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