The BOSS eBand JS-10 Jam Band system lets you turn any room into the perfect practice space. The ultimate guitar or bass trainer, your eBand JS-10 makes practicing as easy as plugging in, loading up your favorite tunes, and jamming along. Play backtracks from USB or SD media and cuts out the vocals with minus-one center cancelation technology. No need to cart around your pedalboard either. Thanks to built-in COSM modeling, you've got all of the killer guitar tones you need right on board your eBand JS-10.