Vocal Zapper By Alesis,The Alesis Vocal Zapper is a stereo vocal reducer in an ultra-compact and affordable 1D4-space rackmount chassis, With the ability to precisely reduce vocals from any CD or stereo music source, the Vocal Zapper features 16 unique algorithms that allow optimal reduction of different types of vocals in various types of mixes. There are two 1D4 inputs and two 1D4 outputs operating at 24-bit conversion and 48kHz sample rate. Internal processing runs at 28-bit.