Digital audio processor (black face panel) 1/4" headphone jack w/ level control. Switchable rec resolution 14/16-bit. OVC adjustment. Tracking adjustment. Auto PB mute. Copy function. Upgrade relays. Upgrade power supply. Use of highspeed bypass caps on most power supply and gain set caps in audio circuit. Highspeed/HF caps on conversion board. (Unit has some obvious wear scratches at top edge but actually low-use.) #8 condition.