have you seen EJs mixer? ...... he puts it right beside him when he plays.....and adjusting it while playing.
i saw it beside his marshall, but his sound was right on when he played in denver. he never approached his mixer or even grabbed his pedals (well... maybe a bit on the pedals).
he was so into it - unlike the typical EJ who just stands up and play - but as usual, daming sabit.
that marshall is just awesome. his got a HUGE sound coming out of that very cool looking full stack considering that he's using single coils.