Roland MSQ-700 Multitrack Digital Keyboard Recorder / Sequencer SN 565455

via this auction

"The MSQ-700 from year 1984 is an 8-track MIDI-sequencer that holds up to 6,500 notes that can be stored. Several functions of the MSQ-700 include a chain function, multi-track function, overdubbing and a merge function. Use it to control your TR-909, or Juno-60 or any other MIDI equipment. The MSQ-700 is compatible with both MIDI and Roland's proprietary DCB sync methods,although it can't do both at the same time."