I have the Kenwood VR-507 and I notice that as I switch from one source to another, there are significant differences in volume. For example, when I watch TV, I usually keep the volume setting at about -45 dB, but for FM, I have to turn the volume down to about -55 dB. Do others of you have this issue, and if so, how is it best dealt with? Have I missed a setting somewhere that will let me adjust the volume of each source separately? Would a preprocessor allow me to set separate volume levels for different sources to make them a little more even?