The Vox SL1B StompLab IB Modeling Bass Processor takes the same expansive effect power as its guitar-related predecessor and packs into a compact chassis for the four-string crowd. Choose from over 60 bass-centric effects like overdrive, fuzz, and enveloper filters for covering your bases whether you're in a jazzy session or a doom metal chug. What's more, the effects are easily sorted and tweaked through a simple interface of Gain and Level knobs which double as value knobs for different effects.