I have a recently cable migrated 2400 IPX to a SV9500 that the external music on hold has not been working on since the cable migration. ASYD sys 1 index 64 b7 is set to 1. I pulled out the EMA Sub-A card and the SW10 switch 1 was set to off, so I turned that on. The external music source was punched down on the white-blue blue-white on the ALM cable, I tried putting that on white-blue white-orange as I had read that somewhere. Neither worked. I put a tone amp on it and I can hear the music all the way up to the system on the EXALM cable. I'm thinking I must have it on the wrong pairs?