I've found that you have added the setting in the last update, as ChannelLevelMeter.
But I added the midi code, (B040 & B041 for the amx channels 1 & 2) and it is not working.
btw, small bug, after closing and re-opening rekordbox, the ChannelLevelMeter is not showed in the list, but if I try to re-add it, I get a message saying the code is already used. (it is included in the export)
thanks