I read the manual and decided to check this thing out. The salesperson recommended that I use it as a pre-amp and plug it into the effects return. It was silent and that was good. It sounded much more articulate when plugged into the instrument input. However, it was accompanied by an audible hum. I guess this is the "low noise" that was mentioned in the manual. Did a search, and there was another configuration - use it as an effect in the effect loop. How do you connect your BDDI? What produces the best results?