Examples of basses whose growl I really like are Jackson JS3, Import BC Rich neck thrus and bolt ons NJ series with active 2band active eq, Ibanez Sr300, Esp Ltd B & F 154dx series. If I remember right the Washburn B10 tone control was more a mid control rather then trad tone. Preamp was boost and loZ conversion. Two volume, tone, 3way pup selector, and push/pull on one of the pots for active/passive selection incase battery went out.
Life for its own carnal pleasure sake. Bass Guitar: BC Rich warlock. Strings: Rotosound swing66. BC Rich club#26. Zoom club#2.