The issue occurs when using the modeled tones with distortion, both with the 8.2 and 9.1 firmware. Muting the open E, and to a lesser extent, the 1st fret, causes a sort of chirp, a very high-pitched noise that overrides the note. The A string has just a slight bit of chirpiness, but barely noticeable. Light pick scraping or tapping of the bridge also causes this sound to occur. I'm thinking it's probably more of a mechanical issue than a firmware issue at this point. Anyone else have this problem? Any ideas for a fix, or should I just send it back? Any helpful advice appreciated. On a probably unrelated note, the part where the tremolo arm screws is very loose and has a lot of play in it. Grrr.... Other than the above gripes, this guitar has a lot going for it. I give it high marks on playability, and I like the sound of the magnetic pups. At least one acoustic model is usable, and I dig the sitar model. I'd like more of the other models if I could actually use them, but the "chirp" issue makes them useless once distortion is involved. Using a Line 6 Spider, btw.