Digital Performer was originally designed as a front-end to Digidesign's Audiomedia hard disk recording system, which later became Pro Tools. In 1990, MOTU added the ability to synchronise audio ( digital audio) to Performer and released it as " Digital Performer," months after Opcode added this capability to Vision. There are many deep features in the MIDI protocol MOTU developed extended capabilities in Digital Performer for handling these controllers and other actions (including remote operation of the software itself) through user-customizable graphical consoles, allowing the operator direct access to deeper features of instruments, stage lighting and various types of machines, all via MIDI interfaces and custom graphic buttons and sliders. Sending a series of numerical values, such a sequencer could direct many instruments, commanding which notes to play, at what loudness, and for how long to sustain them. In 1985, the company released a music sequencer named Performer, also based on the Macintosh platform, for arranging and performing with synthesizers and other devices which recognized the then-newly developed MIDI standard. The program used the Macintosh's high-resolution graphics and printing to allow the user to print professional quality music scores. In 1984, Mark of the Unicorn released Professional Composer, one of the first application programs for the Apple Macintosh.
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