If I understand it correctly you want to use 2 different analog sources connected directly to the amp (Head unit and media player), using 4 of the 6 RCA inputs?
I think you need to make two separate configurations, load both, and switch between them on the Director for each time you want to swap sources. One preset that use inputs A+B to send signals to A to F outputs, and another preset that use inputs E+F to send signals to A to F outputs.
I think you need to make two separate configurations, load both, and switch between them on the Director for each time you want to swap sources. One preset that use inputs A+B to send signals to A to F outputs, and another preset that use inputs E+F to send signals to A to F outputs.