OK, what I noticed is when you have signal on the SVU meters, and the headphone volume is all the way down, there is some sound coming through. It's almost like a broken, crackely version of what's being sent to the meters. I could still hear the music just slightly, but it's a very broken signal. As soon as I turn the volume up a little the noise goes away, and the sound being output seems clean. It's almost like the volume doesn't go completely silent when it's turned down all the way. Kinda wierd. The RCA outs on my SVU seem just fine. Hope that helps.
This is going line out from a JB3 > SVU-2.