I have two MARCS Systems set up on my 996XT. They are identical other than the TG's programmed to them. On the primary system, all TG traffic is "welcome". On the secondary system, I would like to listen to only certain TGs. When I shut off the primary system, I still get the full traffic on the secondary system as if it is the primary. Is there a way to lock out all traffic on the secondary system except the TGs programmed?