I'm still working on upgrading my '02 SR300DX, and I've been tackling the electronics a little at a time. I've bought an SPB-1 and I'm on the lookout for a good J to match, and in the meantime I just bought a Blackouts 2-band tone circuit off T-Mac. The bass has the stock 4 controls right now - Vol, Vol, Tone, and active Bass boost. I will be replacing the Bass boost, and installing the 2-band tone circuit. The circuit is the 2-knob version, but I notice the PCB looks identical to the 1-knob model so I'm considering converting it to 1 knob as a farfetched option. I don't have much experience with bass electronics but have done a lot of work with my guitars and amps. I've never used a stacked or blend knob, but I have used push/pull for coil splitting. I've done some reading about controls and wiring here, and I'm hoping to achieve the most versatile setup I can. I like having the Vol/Vol setup and have read different opinions and info on blend setups, but I'm open to trying it. Options I was hoping to try include active/passive and series/parallel switching. A tone knob to work in a passive setup would've been cool but I'm not sure if I could make it work. So what do you think? I'm open to drilling holes as I already drilled and doweled for a bridge. What is possible, and what would be more useful or practical? I'm open to push/pulls, DPDT switches, concentric pots, blend... lay it on me. P.S. the bass is already active with a 9V compartment so no worries there.