I want to convert my Marcus Miller 5 to V/B/T/T while still being connected to the onboard preamp. I want the bass to be more versatile and I'm exploring options such as the John East Marcus preamp and I never really cared for the no tone passive control feature. I absolutely love the way the bass feels but I sound-wise, I've always struggle to get the sound I wanted which is a fat round punchy tone but not overly bright (as the Marcus is!). Any advise or suggestions would be greatly appreciated. Thanks!