I have a Sony STRDE845 receiver and I want to hook up a graphic equalizer into it so I have a little more control over the audio when I listen to my music. I have no intention of messing with it while watching movies. My receiver does not have a Tape Loop or a specific EQ input/output on the back, so I figured I could hook it inline inbetween my CD player and the CD input on my receiver. However, most EQs use analog RCA plugs. Does there exist a model of EQ that will input and output a TOSLINK optical digital connection? If so, can anyone recommend a good model to check out.