I will try to condense this as much as possible. A couple months ago I bought this guitar: http://www.rondomusic.com/pendpro82528ebemgocean.html It was an upgrade from the Schecter Omen 8. I was super pumped about it. Now I'm about ready to sell the fucking thing and get something else. Firstly let me say I'm tuning to FBEADGBe. Nothing extreme here. It started with intonation problems on the top string. Long story short I put an .80 on top to see if that would intonate better. It did, all my problems were solved! Except not. Now when I play the string open it does this weird harmonic thing almost like I'm doing a natural harmonic. I tried a .76 and it's not as bad but it's still there. I've been going around in circles for so long I'm starting to wonder if I'm losing my mind. If anyone has the slightest idea how to save me from this insanity i will be forever grateful! Here is a clip of what I'm talking about https://www.dropbox.com/s/f7fp7kowbl8mh8a/8string-noise.mp3?dl=0 In the recording I'm just going back forth between palm mute and open on the low F. No reason you should be hearing the high frequencies that you are hearing on the open notes. EDIT: I should probably also say that I have the strings behind the nut muted because I already know someone is going to say that.