I remember seeing sadowsky preamps 15 years ago before they were potted in that black stuff, and if I recall correctly, they are simply a fender tone stack between two fet common source amps. Sort of like an alembic F2B with fets instead of valves, and for onboard of course. (I'm happy to be corrected here.) So that big mid scoop is there in the tone filter. You can only really boost the treble and bass. MM players tend to be big fans of that clicky upper mid thing, so a pre like Roger Sadowsky's is pretty much just the opposite of this and will make your stingray sound very different. Personally I've tried, but simply can't dig the typical MM mid range so I have a preamp with a slightly scooped voicing in my MM and it sounds great, very slappy tone.