Hello. My '91 Jazz Plus V's preamp has died so I'm looking at replacement options. It's rear routed for three knobs, two of which are stacked. My requirements are: • Active/Passive switch • Adjustable mids Strongly prefer vol/vol over vol/blend. So I found the Aguilar OBP3 which seems like it would give me everything except the active/passive switch (unless I drill for a switch). There's also the Noll TCM3 and TCM 4XM, which would give me everything I want except it has vol/blend instead of vol/vol. Is there any possible way I can make that Aguilar work with some kind of push-pull pot to give me that switch? Are there any options I'm missing?