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From: Carl Makin <carl@stagecraft.cx>
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Subject: Stopping playthru
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I'm trying to do some ham radio digital modes with a second soundcard 
on my celeron 600 under 4.8, and for the most part they are working 
really well.  Except for one problem.  It seems sound in via the line 
in socket is being played through the line out socket, ie it looks like 
playthru is enabled.  This is a royal PITA as it interferes with both 
the transmitting and receiving signals.

Can anyone give me a clue on how to disable this please?

Thanks,

Carl.