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XLR and 1/4" TRS will most likely be internally directly connected as they are the same (if both are balanced), so don't plug into both.
The RCA input may be internally connected at the ve, or it may be a separately buffered and level matched input. You would have to check schematics from service manual to be sure.
Other option is a normal mixer or a summing mixer. Summing mixers are basically just rack mount 1U mixers with gain trim controls and nothing else - Behringer MX822, ART MX822 etc. |
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