Hello: I use a Ampeg SVT3-PRO with a Warwick Thumb Bolt-on. It sound very nice and clean, perhaps too much clean... I like sound more aggressive.... Perhaps it´s because the power amp of Ampeg is Mosfet and not tube, but I can´t change the amp. Anyone knows what´s the effect that I need to sound with a little distortion like Gluecifer, Foo fighters ... Thanks !!