I have a wall panel in the studio with speaker and instrument ties from the control room to the live room. 1 instrument tie, 3 speaker ties. When running a head in the control room through the speaker ties while also running an instrument level tie through the instrument jack, there is a huge amount of crosstalk from the speaker line into the instrument line. The speaker lines are all 2 conductor 14 gauge. The instrument tie is shielded Mogami. Any ideas on how to solve this problem?