so I picked up a c-45 preamp. The issue is I have an SAE 5000A that at times I use for some old worn records, I know some folks hate stuff like this but it does work and it keeps the pops and ticks out of my speakers. My question is my mx-130 had listen and record knobs so it was very easy to integrate the 5000A into the system when it was needed. How do i do that with the c-45?