Just bought a Fostex PC1EX Monitor Volume Controller http://www.fostexinternational.com/docs/products/PC-1eBW.shtml
It comes with twin RCA cables and a mini-jack cable. I am already using the headphones input on the UA-25EX and my RCA cables are going from the UA-25EX to the powered monitor. Assuming that I remove the RCAs from the back of the UA-25EX and connect them to the PC1EX, how do I then connect the UA-25EX to the PC1EX volume controller?
 
Many thanks in advance!