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Early analog music sequencers used control voltage / trigger interface, but have generally been replaced by digital sequencers utilizing MIDI. A MIDI sequencer plays back MIDI events and MIDI control information at a specified number of beats per minute.
Many synth modules, such as the Korg Triton rack module, include a built-in MIDI sequencer. There are also standalone hardware MIDI sequencers, such as the Yamaha QY-70.
Software music sequencers run entirely on personal computers. These come in two varieties- pure MIDI sequencers and MIDI / audio sequencers. The former only allows the recording, playing back and editing of MIDI data. The latter adds the ability to sequence MIDI data alongside audio data.
Music sequencing software