I bought this unit, and would like to buy the cables that are required. I will use with a Chord Qutest or Topping D50 DAC. Neither have balanced outputs. I am using as a preamplifier. Neither of the amps i own have balance inputs. So basically I will be using RCA cables all around. On the back of the Cavelli unit there are two RCA labeled "Pass". Can these be used as an output to an amplifier, with the Volume control working, or does this bypass the volume control? Do I need to use the front 1/4" output and order a cable with 1/4" male stereo phone plug to two RCA plugs?