Music sequencers are hardware devices or application software that can record, edit, or play back music, by handling note and performance information.
The following are specifically designed to function primarily as the music sequencers:
Several tiny keyboards provide a step sequencer combined with an independent timing mode for recording and performance: Several machines have white and black chromatic keypads, to enter the musical phrases.
Groovebox-type machines with white and black chromatic keypads, often support step recording mode along with realtime recording mode: Other groovebox-type machines (including several music production machines) also often support step recording mode, of course: Recently emerging button-grid-style interfaces/instruments are naturally support step sequence.
Also often support Gate clock and DIN sync interfaces.