My bass sounds great direct, I can get most of the sounds I need directly from the bass. However, when I go trough a bass preamp-head it turns out that only a neutral setting on the bass works well. I suppose this is good, however I would like to be able to have more verstatility from the bass, so I have though of changing the onboard preamp. I looked at bartolini's sight and its a little confusing. I am looking for bright sounds. Which one pream model is best for this? do I need to change the pickups also?