Korg SQD1 sequencer
I have no way to test effectively but all things appear to function.
The SQD-1 is a classic and easy to use stand-alone sequencer. It has 15,000-note capacity and 2 tracks. Your song is created by bouncing down between these two tracks as you go. Real-time and step recording is available as well as pretty in-depth and precise editing of events. It has a built-in 2.8″ disk drive that can store up to 30,000 notes of data. (1986)