Ok, I figured it out. I needed to output stereo mixes for in-ear monitors. First link two bus mixes, for example 7 & 8. Then you can set the levels via using the Sends on Faders function, or by selecting each channel and using the Bus Sends 7 control on the Channel strip. The Bus Sends 8 control becomes the Pan control. A little convoluted, but works ok.
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