BOSS Dr. Rhythm DR-550 For sale is the main unit only. Tape, etc. are affixed to the exterior. I have confirmed basic operation with an AC adapter, including power-on and stereo output. Since it is old, please understand that it is sold as-is, with no claims or returns. - Connection Terminals: Stereo output terminal - MIDI: IN only - Condition: Tape marks on the exterior Thank you for viewing.