Hi Lynn: Met you at Elmhurst College (Aebersold Camp) years ago. Here's my issue: have been using an Underwood pickup forever (Poellmann bass) -- yes, crazy old school pickup -- and fine for most gigs. But at high volume levels I have feedback issues that I see other players NOT having -- so thinking that this ancient pickup is the problem. What is the best pickup for higher levels? YES -- tone quality IS all important! Time for me to get updated here. Is there a pickup that has the best rejection pattern? -- to borrow a microphone phrase. Amp is the 800 watt Mark Bass system.