I have a Partner 8.0 recently installed to replace an NEC system. The customer has paging with music and the same music on MOH. Both amp and Partner need an RCA plug and both RCA plugs operate fine on the amp but neither works on the MOH. I have shaved off some of the sleeve to the RCA for the Partner RCA. I am left to beleive the partner requires an input level other than 600 OHMS and the music source is not 600 ohms. We are usijng an early version of an IPod for music.