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via
this auction"The SQD-1 is an stand-alone sequencer released in 1986 by Korg, maybe the first MIDI sequencer of this company. SQD-1 can store up to 15000 notes over 2 tracks, with additional storage available on 2.8" quick disks (30000 notes per disk).
The interface resembles a multi-track tape deck with "bounce tracks". Both real time and step recording are included, with usual editing functions such as copy, insert, delete and erase.
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MIDI support is also included, along with Din and tape synchronization."