OK, I'm looking for a cheap solution to balance the volume between 2 basses. In the past I've used a boost like the MXR micro amp but I no longer have one. So I'm thinking about coming at it from another angle. I use 2 passive basses, fretted P and fretless J. The fretless is a bit quieter so needs a boost but rather that boost the fretless can I just lower the P volume? I don't want to actually turn the volume down on the P because it's passive and I want he best output from the pickups. If I put a resistance mixer such as the DOD 240 in line and lower the volume will that simple lower output without affecting tone?