Flats, good Palm muting technique or foam at the bridge, Alnico V enamel or formvar equipped pickup wound from 10.5-12k and a Fairfield Circuitry Barbershop does the trick for me. In fact, of all the Ampeg in a box's that are out there, none of them sounded as genuinely warm and tube like as my Barbershop. I can come incredibly close to some of the isolated Motown bass tracks (such as Bernadette) with that setup. A lot of the other drives I've used for the same thing were great, but had a little too much honk going on in the mids, or lacked them. I was a big Sansamp guy and it knocked all that stuff off my board for an "always on" vintage type of thing, which is what I was going for. I also run compression before the Barbershop, soon to be giving the Keeley "Bassist" limiting amp/compressor for a spin.