The LX15B channel features a 3 band EQ for tone shaping plus an onboard compressor and a Shape switch this provides a great sounding go to setting from a single button press. The mini-jack AUX input allows for connection of a playback device such as MP3/iPod/CD for jamming along to songs or backing tracks, plus there is a headphone socket a great feature for private practice or silent late-night sessions. Available in Black, Red and Camo. Shape Switch A shape switch applies a pre-determined EQ curve to the input signal. Applying a Mid cut, Bass & Treble boost pre the EQ tone stack of the amplifier. 3 Band EQ Allows the adjustment on the bass, middle and treble EQ content of the signal.