>
>Carey Fisher - NCS wrote:
>> It's sort of a long story but each of the two opamp mixers is in a 
>> separate box and the summing junctions have external connections on 
>> each box.  I need to "sometimes" mix all four signals 
>together without 
>> adding any hardware except a cable between the two boxes.

You could just connect the output of one of the op-amps to the summing
junction of the other via a suitably sized resistor.  This would give you
all four outputs on that amp.  HOWEVER, two of the inputs would be inverted.
Whether this matters or not would depend on the application.  There's no
good solution I can see within the limitations you have specified.

Mike

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