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Hahaha nice try.  :)  In my limited experience with audio A/Ds (I only 
know a few parts in the high end) all analog inputs need to be biased to 
2.5V.  The standard way to do this is a DC block cap going to a resistor 
divider with one end at the +5V the A/D uses for the analog section (or 
a trickier variation of this theme).  Many have built-in (tho usually 
defeatable) highpass filters as well.  I'm not sure if DC of any 
significant amount (i.e. more than say 200mV) can go thru the A/D 
without completely throwing it off.  None of them are designed to handle DC.

J

peter green wrote:
>> A more serious concern is the unavoidable DC blocking cap.  No way 
>> around that.
> a blob of solder?
> 

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