Your general opinion of this product.
I have several pieces of rack gear that I use in my guitar rig. I have an '80s Ibanez UE-405 that runs in front of my amp (GREAT analog piece; parametric makes a killer solo boost). Then I have T.C. Electronics G-Force and Rane Parametric in the loop. Even with a conditioner, aweful hum. Put Humfrees on all but the conditioner. Voila! No hum!