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you can use 2 resistors about 4.7 K ohm.
connect one of them to channel left and one of them to channel right.
and connect other side of resistor together. this connection will be mono output.
Yeah, this passive combining is OK, if you don't want a mono channel beside left+right, because it creates a coupling or crosstalk to the other channel. If you want a mono beside left+right, then the right way would be using an active stereo-to-mono circuit (2 OP amps or two transistors, etc).
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