I recently started playing around with a 12 string bass. I was messing around with different configurations, and found I liked the sound of it with my swr baby baby blue lined out to my fender vibro champ. the issue is no matter how much I roll off the bass I can't seem to get the fender from farting. Would there be a good preamp for this without getting too complicated or expensive? maybe some kind of inline crossover? any feedback is good! Thanks!