The ALC-4 part of Pro Power is a four-channel amplifier controller designed to provide the user with a variety of audio options and features. It features a combination of stereo inputs, outputs and preamplifiers, as well as a dedicated mix bus section and master volume control that can offer a wide range of different sounds. With its automatic or manual gain and deep bass control setting, the Pro Power ALC-4 can be used to create a smooth, powerful sound. It also includes several different routing and control options, allowing the user to customize their sound in a variety of ways.