Yamaha AR-1500 is a guitar amplifier that allows you to shape your sound using a variety of controls. It features a gain knob that controls the amount of distortion applied, a distortion knob that controls the character of the distortion, and a master volume knob that controls the overall volume of the sound. The sound equalizer section lets you control the gain or attenuation level for the high, middle, and low frequencies, and the presence knob controls the gain or attenuation level for high frequencies above the treble band.