loud noise from the amp

[fenderrules]

erm...i just came back from a jamming session, but it was a bit screwed up.

i jammed at alvron studio, near bukit timah. we used room 1

well, i was plugging in my guitar (a j&d lespaul standard, its actually a friend of mine's) into the boss mega distortion pedal (the orange one) and into the amp. with the mic not on yet, i plugged my guitar setting into the amp.

then all of a sudden, a loud sickening noise (like a screeeeeeeeee) came out from the amp when i turned it on as well as the distortion pedal. it stopped when i lowered the amp volume and turned off the pedal distortion, and also switching the lespaul to ryhthm mode.

how can i prevent this?? it happens everytime i plug in to jam.

 

[Indigo_blues]

simple, always put amp volume to zero before you start.

 

[fenderrules]

yes ive tried that, but it always keeps coming back again even if i dont touch my guitar or anything else, and if i on the mic, even worse

the noise kinds of like bounces off the walls, like a neverending siren..ouch.

 

[LEMONed_Z]

stand further away from the amp. or reduce the gain.