Ahhh +4 hey!
When I switch the analog Inputs in my session between -10 and +4 I can hear a relay click on the card, I assume it's disconnecting the -ve line of the balanced configuration for -10. Can't hear any relay for the output though.
If you are running unbalanced with the +4 setting I can see how this could make an improvement, as you are not shorting out the -ve side of the output chip with the connector.
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