Only on a low F?
It sounds like something is resonating from that particular note. . Have you tried playing in G instead?
Hehe you're kidding right?
I was playing this powerchords progression (for the sake of explanation...root note on 6th string, if you will):
B5 A#5 G#5 F#5 <--"BBBRRR"
G#5 A#5 B5 C#5
I couldn't really re-check that
cuz, you know, you are playing in front of people and nobody non-music-educated wants to hear funny noises while in a party
Actually I'm 3rd owner. The guy who sold it to me warned this "i was told not to play too loud, so don't do it either". I didn't see it comming. D4MN!!