M-48: Is there a way to route the talkback mic from the M-400 directly to the M-48 as you would do a channel instead of having to route the TB on a AUX?
When you are assigning sources to send to the M-48's in the M-400's "REAC B Output" patchbay, at the very bottom of the list of sources is the source "Talkback". Patch this as one of the 40 sources you are sending to the M-48's. In each M-48 unit's Group Assign, do not assign this port to a Group (or the talent can turn it down if they want). Also: Be sure this Talkback port is turned up in the SOURCE LVL/PAN setting of each M-48.