The Homebrew Electronics Bytchn Swytchn A/B/C Switcher enables you to switch among one of three outputs. Outputs A and B are line level buffered. Output C is a direct unbuffered out. To avoid ground loop hum Output A is isolated from Output B and C via a high quality American-made Jenson Transformer. Utilizes hard wire switching (no relays). All USA Made true hard bypass hand wired point to point.