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Re: Insert Jack question.

As I understand your drawing, you are sending the tip straight thru' and using the insert on the ring. That means that you are inserting on one half of the balanced signal, letting yourself in for all sorts of weird processing. An unbalanced insert box should have a ts going into the mixer, the tip of this being fed to the ring of the insert jack. the switch of the insert jack should short between the tip and ring when nothing is inserted, and the tip of the insert jack should feed to the tip of the output jack. This is fairly simple and will work with most mixers. If you use a panel jack on the input, then that should be a stereo jack with the ring shortened to ground, so it wont matter if you use a trs cable between mixer and box. The same on the output, then you can drive all balanced and unbalanced gear (as long as there is no phantom)

Some equipment don't like to have the negative of a balanced output shortened to ground, and will distort a few dB below stated maximum output.