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1-500: The Oberheim DS-2 is a pre- MIDI digital music sequencer. Designed and built in 1974 by Tom Oberheim , it is considered one of the first ever digital musical sequencers. The DS-2 is capable of storing and sequencing 48 notes and provides a single channel of CV/Gate input and output. It can also be clocked externally. A later model, the DS-2a was capable of storing up to 144 notes. This article relating to electronic musical instruments