Currently there are 2 methods with the option for a third if requested
Using the 5.1 Output for Metering
Advanced menu 19 is used to select the Alt-Output function, select '5.1 Meters' to use this output for metering.
Connect a unused Cue output to Stereo meters
There are 4 cue outputs on the A-Mon, if you have an unused output it can be used to meter the Left and Right down mix by enabling 'Link' in the cue sends page. If you also enable the talk back to the cue output you can check that the talk back level is correct (thanks to Owen Curtin for this suggestion).
Modify the 7.1 rear outputs to feed Stereo meters
If your speaker setup is Stereo or 5.1 we can supply a plug in modification kit to route the Left and Right signals to the Rear Outputs. This will require a software switch added to the A-Mon which I am happy to add if/when a customer asks.