The MIDI (Musical Instrument Digital Interface) specifications serve as the essential framework that enables electronic musical instruments, computers, and other related devices to communicate and synchronize with each other. Developed to create a universal standard, these specifications define the messages, commands, and protocols that allow devices from different manufacturers to work together seamlessly. The MIDI Association maintains and publishes these specifications, ensuring compatibility and innovation across the music technology industry. From basic note-on/note-off messages to advanced control protocols like MIDI 2.0, the specifications cover a wide range of use cases—from performance and production to lighting and automation. Understanding MIDI specifications is crucial for developers, musicians, and engineers who aim to integrate or build MIDI-compatible tools and systems in today’s interconnected musical ecosystem.
Is there a consolidated list of Spec documents referenced by title *and* code (e.g., MMA RP-021) from which members can directly download?
For instance, the doc entitled "Common Rules for MIDI-CI Profiles" is also known as M2-102-U. Within it, there's mention of "MMA RP-021" but no title given. I've found "RP-020" but not "RP-021" after navigating through each subsection beneath https://midi.org/specs
Ideally, there would be a single .zip (or .tar.xz) file with everything in a single bundle.
Does anything like this exist?
I don't know of a list of all the document numbers, that would be useful. But here is RP21: Sound Controller Defaults (Revised).
Thanks for the direct link!
I don't know of a list of all the document numbers, that would be useful.
Challenge accepted! See removed link
I kept direct links out of the doc, because such URIs may change with future revisions of various specs.
I really appreciate this post — it clearly explains why MIDI specifications form the core of digital music communication. As highlighted, the specs define the essential messages, protocols, and command sets (from basic note-on/note-off to advanced MIDI 2.0 control) that ensure seamless interoperability between instruments, computers, lighting systems, and more
This foundational overview is especially valuable for developers, musicians, and engineers looking to build or integrate MIDI‑compatible tools. It emphasizes how the MIDI Association maintains these standards to support global compatibility and innovation.
Moreover, the post invites further discussion about accessing specifications like RP‑020 and RP‑021—which are critical for advanced implementations—and shows the community's willingness to assist newcomers in navigating the documentation.
Thanks to the author (Inam Khan) and contributors—this thread sets a high standard for clarity and inclusion in technical discourse.
There's a discrepancy in M2-104-UM, Universal MIDI Packet (UMP) Format and MIDI 2.0 Protocol spec.
The text of various sections disagrees with tables in its Appendix: i.e., Are certain messages 64 bits or 128 bits?
Text within section 7.5.3 Set Tempo Message indicates that it's 128 bits, but Appendix G: All Defined Messages visually shows only 64 bits (excludes Reserved bytes without indicating that anything has been elided for brevity).
Which one is correct?
Can someone here notify whomever maintains the spec docs?
Err-- the discrepancy mentioned in previous comment was my mistake.
(My PDF viewer clipped the rotated page at exactly the wrong place.)
Anyway, be aware of Table 34 All Defined Message Formats (in 5 parts) in M2-104-UM doc having its rightmost column "Bytes 9-16 (64 bits)" at a very different visual proportion than all its other columns.
Since the forum removed the link to the file in the earlier post with a consolidated set of links to spec docs, see attached PDF.
Or visit:
gist . github . com / dpezely / specs . md