I know the Woolly Mammoths suck with active basses but I have found this.. http://news.harmony-central.com/Newp/2003/Dragster.html It is for getting the impadence of your guitar signal. And the problem with playing Woolly Mammoths with active basses is that they have lower impadence (i think?) so would raising the impadence with this gadget fix the problem?