On a Fireface UCX Y am using to ear a stereo channel two TR plugs that goes from (AN1/2) out 1 and out 2 --> to the aux line of amplifier, that have only 2 RCA sockets (dx&sn), each for every rca; is this correct or may be dangerous for the interface? And If Y have to use a TRS plug how Y have to connect the termination of each cable from TRS to the rca plug ? Thanks niky