Why does my amp (which is a very expensive, high-quality stage amp) keep buzzing and how can I make it stop? Other than the buzzing, it sounds and works great. It's a Vai Legacy stage amp. It is a few years old but hasn't seen a whole lot of use. I have an electric guitar (Ibanez Prestige) plugged into it via a Line6 POD UX2 (which, in turn, is connected to my laptop). The POD sounds great on headphones, and the tones are great on the amp, but there is always buzzing (whether or not I am using "pedals" in the PODFarm software).
From personal experience as well as working with well respected engineers, guitar amps make noises. A lot of time this has to do with the type of amp and setup that you are going for. Sure, you can get a fairly clean sound out of certain amps/guitars but if you're playing a rock setup, your amp will be making some noise. This is only really an issue if the noise is overly audible while you're playing. Typically the amp noise is drowned out when playing and is really only noticeable when you're not. So if it is audible while playing, then you may need to get your amp or guitar checked. A lot of times this sort of noise is mostly noticeable because the amp is turned up rather loud and distortion effects tend to make this much more noticeable/present. In the end, if you're not sure about the amount of noise you're hearing, it may be worth taking it to get checked out. Usually any sort of technician will be able to offer up some advice on how to reduce the noise if it is functioning as normal.
I've been using Line 6 since the day they came out. I didn't want to admit it when I figured it out, but the circuit it's self inside the line 6 can cause a buzz or humm... The only way to fix mine was to set up the rig without my POD HD Rack Mount. Then the noise was gone. It was a bummer to realize this cause I had to spend a lot more money to gain the convenience line 6 brought to the table. I replaced cables, cords, changed outlets, and bought a whole new head and none of these fixed it. I bought the head cause I was chasing a particular sound/tone not because of the hummm. As soon as I built the loop without the POD my signal was clear and crisp and noise. Just try it and see. Otherwise I agree with the guys above.