OSII SWITCHES - Use this to select the input of each channel (phono / line). Using this "Optical Scratch" switch to perform various tricks is much faster and quieter than conventional switches.

OSII LOCK [top center] - Locks the OSII in its current position to avoid accidentally switching sources. Whether the OSII is in phono or line, activating the OSII lock will keep it there even if the OSII is moved.