A hardware device or software application that allows for the composition, editing and playback of MIDI sound sequences. Media player applications can play MIDI sound files, but creating and modifying MIDI files requires a sequencer.
A MIDI sequencer for Windows that sells for under $100, Twelve Tone Systems, Cakewalk Express supports many of the high-level functions found in more expensive packages, such as track parameters with General MIDI patch names, an event edit list with color-coded event types, and a mixer window.
The pianists performed each melody three times, and the nine performances were performed on an electric piano that interfaced with a computer and MIDI sequencer. These data were used to set ideal levels of loudness, tempo and articulation for each melody.