I have two RM16AI mixers that I am cascading with a CS18AI and the MOTU AVB Switch. All the components are the latest firmware. When I cascade the units, there are no FX's on the slave unit's inputs, only on the master unit. Both mixers work fine independently with the AVB switch, UC Surface, or direct connect with Ethernet. Both units are set to Static Self-Assigned IP Addresses and all the other processing such as the EQ's, Compressor, etc. work on both units when cascading. I am not using a router in my system as I don't need or require wireless control of the mixers. The FX routing is set to 'post' on both units and the FX levels and returns are set to unity as well as the Flex fader. I have performed a firmware recovery on all the components just to rule out a firmware issue. I'm stumped.