Overdrive comes from overdriven (too loud) amplifiers.. usualy overdrive comes from tube amps which are overdriven and there you get the sound.
distortion - got nothing to do with the loudnes of the amp. the distortion cuts off some parts of the sound wave and that way we get the distorted sound.
the overdrive sound is the sound of all the "oldie rock" players and all the blues guys. most of them didnt use any pedals but turned they amps as loud as they could and so they got the overdriven sound
"They think im crazy..
but i know better.
It is not I who am crazy.
It is I who am mad.."
ren hoek