WA-MPX is an authentic reproduction of the most revered tube microphone preamplifier that ushered in the birth of rock 'n' roll and radio-ready hits. During the golden era of tape recording, this type of vintage tube preamp became the signature sound of many hit artists, including Elvis Presley, Kurt Cobain, Les Paul and Bing Crosby. This is still a sound sought after by many great artists today. With premium components, a faithful circuit design and adjustable tape saturation WA-MPX authentically reproduces the analog sound of the original to add warmth and color to every signal.