FX priority and overriding If an FX is activated, it overrides any other settings for the parameters that the FX modifies. For example, an FX that modifies the zoom will override any zoom angle set on the zoom channel (DMX channel If the same FX is selected on both the FX1 select and FX2 select channels, only the FX1 adjust channel is active. The FX2 adjust channel is ignored. If different FX are selected on the FX1 select and FX2 select channels, FX2 is superimposed onto FX1 and FX2 overrides FX1 whenever both FX modify the same parameter. RDM RDM (Remote Device Management) is implemented in the MAC Aura XB and RDM communication is possible over the DMX data link. As provided for in the ANSI/ESTA E RDM protocol, the fixture can send information about its RDM-accessible parameters to an RDM control device.