Re: Insert Jack question.
I don't like to repeat my self so I'll just cut and paste from my earlier post.
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Perhaps a pair of TRS jacks with switch contacts on tip and ring of the second (return) jack that normal through from the first (send) jack. The typical mixer insert jack uses the tip and ring switch to break an internal unbalanced path with a single jack. To keep it balanced requires two jacks...
You can wire it up so patching into the standard send jack does not break the path, but patching into the return jack does, or you could use two switching jacks so patching into either breaks the path.
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Using a pair of TRS jacks one for send and other for return maintain signal balance.
The send is just a parallel output also sent to the switch contacts on the return jack to pass signal when nothing is jacked into the return. The return jack uses the switch contacts to break the normal signal coming from the send jack and accept the patched signal.
JR
