Advice please I have a Bart equipped Jazz style bass with their 3 band 9v pre. I love the sound, but it has much less output than my other basses, even the passive ones. I have to turn up the amp so loud to get the normal volume that I introduce an unacceptable level of noise from my amp. The battery is good, I've checked the 2 trim pots on the circuit board, one seems to affect the the 'slap sound' you pull up on the Vol. pot for. I could not determine what the other was for, no real noticeble affect. Is this par for the course with the Bart's?