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The usual way to connect a 3-pin XLR to a 1/4" stereo jack is to use the following pin allocation:

This wiring configuration gives you a balanced mono audio cable.
| Audio Cales and Connections | |||
| Audio Cables | XLR to 1/4" mono jack | XLR to RCA | Stereo jack to 2 x RCA |
| Audio Connectors | XLR to stereo jack | XLR to 2 x RCA | |