Howdy folks! This is a new step in my life... yes! I finally moved in my own place and left my Mom's nest. Yuppy. Finally I can 'nearly' plug my basses when I feel the desire (just avoiding to play loud at night hours) and then, that's great, huh? But there's a big issue... So to make it clear, first of all: I kept all of the same tools that I have : a Mac computer, a Native Instruments Komplete Audio 6 USB digital interface, and the 3 same basses that I own. My computer is plugged in the same power strip (lightning protected). On the 3 basses that I have, 2 have got an humbucker pickup. The first bass has a JH (Jazz Humbucker) pickup configuration, the other is a single H pickup, with each coil having its own volume knob control. Of course, what does a humbucker do when fully opened? ... Yes, the hum is gone! For example ; if I play my JH bass with the pickup balancer all the way to the J pickup, the hum is present. If I set the balancer in the middle, it starts to get quieter, but still not away because I think that the two pickups are in parallel (I'm joining the datasheet so you could tell if I'm right or if it's operating in series mode). And then, if I set the balancer all the way for the H pickup, that hum goes out. Bye ! On the other example with my single H pickup, if I only open one volume knob to its maximum, the hum is present, but the two coils get their volume knobs fully opened, the hum is gone. My third bass is out of the story and can't away the hum because it's a PJ bass (Precision Jazz) and nothing will make the hum disappear. I recorded the signal when I'm not playing anything and when the strings are completely quiet (at least not hearing anything with the volume set at 2/3 on the DI), using Audacity, and used the frequency analysis tool provided. The hum seems to have a fundamental frequency of 300 Hz with a infinity of harmonics going up to 40 kHz! (yes 40k...) What do you guys think it could be causing the hum? It's rather sad when you go from a place where all your recordings are perfectly great and not facing any bad noises, and then you go your own place and your ears get teared down by a fricking hum... I swear that in some cases, it's very harsh to the ear and not pleasant at all. Of course I tried using noise reduction on Audacity as well... but it removes a tone of harmonics in the timbre of my basses, and it nearly makes them sound like robots, or it least a lot less natural, if heard on good headphones. That, and sometimes a ultrasounding hum goes in, but it's clearly intermitant and it could be when the fridge goes on cooling mode or so... can't really tell. As well it's very sad. Thanks for any idea to a solution. Musically speaking, Bapt.