Once you set up the 24 bus mode (config mode>options>System>bus configuration), You can select the variable groups either as the output fader layer or the 3rd page of "aux sends" in the input channel section. This will change the aux 1-8 buttons in the flip to faders section to var. groups 1-8, as well as the aux send encoders in the input section. They will then act just as the regular aux sends, you can pull them up on the assignable ch. encoders, or flip them to faders just as you would the auxes.
Thanks for the reply. It was simple enough once I was infront of the bloody thing!
One issue I had, that I couldn't solve, was my cue/listen wedge was about 10dB louder than actual mix.
In the "solo & monitor operations" window, pfl was selected, level trim was at 0dB.. I just brought my cue fader down to match.
Sadly I was using someone else's show file, but couldn't see anything obvious ticked.
Monitors were M2's all on D12's, all with same OS.
The fact it was 10dB made me think it was a setting somewhere. All outputs were from one stage-box, so it's not a stage-box/FOH mismatch.