We are having issues with our bass player, he plays louder than the guitarist and is very trebly. There is no bottom, we've addressed this with him and he had a better tone at the next gig, but soon went back to his old ways. We made a recording at our last gig and he was overpowering both guitarist and was still very trebly. He's a good friend, but I told my lead vocalist that if he did not change I wanted to fire him. Has anyone had a bass player like this? Any advice on this matter would be appreciated.