For acoustic guitar, electric bass guitar & keyboard. The Hog 30 was designed with bass, acoustic guitar and keyboard players in mind. If you need portability combined with power, look no further! The Hog 30 front panel features volume and master volume controls, as well as a Funk BassTM switch for extra punch and depth. Rear panel features including headphone and line out jacks. The Hog 30's batteries will provide hours of portable playing, and playing through headphones will extend the time between recharges even further.