Can anyone here give me a rough idea of what the heck it was I heard last night on my practise amp? It's a Fender Bassman 10 from 1972. Acually I had the guitar in my stand and was getting a cup of joe and all of a sudden this loud sound like a fog horn started to wail on me. Turned the amp off then on again and it worked fine but I'm nervouse. I'm almost positve it wasn't feed back the volume was only on at about 2.5 and the guitar strap was laying across the strings so they weren't vibrating. I have it scheduled for repair next week but I'd like to give the tech as much info as I can before leaving it with him.