Hey everybody this is my first NBD post. I bought this bass off a TBr and only had it for a few hours before I took it to a tech to get modded. It's got a new pick guard, tuned to BEAD and has an Aguilar HC jazz pickup. Like three weeks later I FINALLY got it back from the tech and here it is. However I was just playing it and I noticed that if I turn down all the tone knobs to off I can still hear the bass through the amp. Does this mean the preamp is off? How is this different than bypassing the eq or having a passive instrument? Just curious to hear from those who know.