Packing the same effect modeling power and compact chassis as its predecessor with the addition of a pedal necessity, the Vox SL2B StompLab IIB Modeling Bass Processor boasts nearly everything a bassist could need. Built with the same 63 effects as the IB version with an added expression control, the StompLab IIB toggles from overdrive to boost to envelope filter through an easy to use interface and small design that won't trip you up.