Hey mrboson, Just a quick non invasive test of my BJr, reveals virtually no hums or hisses in all positions. I quickly ran a tele and a humbuckered LP through a few scenarios and I am hearing nothing out of the ordinary. There is an almost imperceptible low frequency hum when the thing is at idle, but then again this is the same low frequency hum that I hear with almost any electrical appliance. I am hearing the same sound - if I listen really hard - with the Mac computer I am now using. I am sure other BJr users will have a more detailed and technical analysis for you, but for now I hope this helps you.