I just got a new 500x and all of the patches that I have tried sound horrible. Most have this really thin buzzy sound, especially the high gain ones. Both the default patches and those I've downloaded online sound this way. Even the clean patches will have a buzzy sound when you strum hard enough. It's not a hum type buzz that persists when you're not playing. But when playing, most of the patches sound like you have a tin can for a speaker. Please tell me there is some setting I can tweak to fix this, otherwise I'm returning it!