I'm trying to figure out exactly what the "Send Level Messages" checkbox does in Totalmix.  I've updated to 3.09 and am using a Mackie Control Universal in MCU mode.

Everything is working fine, but that checkbox appears to do nothing.  I do not see any activity on the signal lights or anything on the display that looks like a level.  For each channel all I see is the label and the fader setting (0.0, etc).

Is there a button on the MCU I have to push to enable to level meters or am I missing something?