The AX5B contain 58 modeling effects powered by Korg"s proprietary “REMS” modeling technology, including a wide range of amps, cabinets, modulation, and delay/reverb. Not only does the AX5B pack a wide variety of essential effects into a compact processor, but they also boast the same quality of effects as our top-of-the-line AX3000B. The AX5B features a built-in expression pedal that can be used to control volume, wah, or many other effect parameters, giving you a virtually limitless range of possibilities. With easy operation that will have even a beginner playing great sounds right away, a compact size that slips easily into the pocket of your gig bag, and the flexibility of battery-powered operation, this unit makes it easy for you to enjoy top-level bass sound in any situation.