SAMPLED

MIDI, formats and standards · updated 2026-08-16

MPE

MIDI Polyphonic Expression — each note gets its own channel so pitch bend, pressure and slide are per-note.

MIDI DIN in/out connectors on an RME audio interface card — the physical ports behind the MIDI, interface and I/O terms in this section.
MIDI, formats and standards — MIDI DIN in/out connectors on an RME audio interface card — the physical ports behind the MIDI, interface and I/O terms in this section.

Photo: RME Hammerfall DSP 9652 MIDI connectors (opens in a new tab) by Dan Lynch (opens in a new tab), via Wikimedia Commons — CC BY-SA 2.0 (opens in a new tab)

Key takeaways

  • MIDI Polyphonic Expression — each note gets its own channel so pitch bend, pressure and slide are per-note.
  • It is what lets a controller bend one note in a chord while the others hold.
  • On an MPE controller, sliding vertically on one key can open the filter for that note alone.
  • Watch out: enabling MPE on a synth that is not MPE-aware.
  • Sits under midi, formats and standards in this glossary, with 2 primary sources below.

Quick checklist

  • Can you define mpe in one sentence without looking?
  • Can you point at mpe in a real session, mix or contract?
  • Have you tried the practical move above at least once?
  • Would you catch the common mistake before it costs you a take?
  • Have you opened one of the primary sources below rather than a forum thread?

MPE IN DEPTH

MIDI Polyphonic Expression assigns each note its own MIDI channel so pitch bend, pressure and slide apply per note rather than to the whole patch. It is what lets a controller bend one note in a chord while the others hold.

How it works in practice

On an MPE controller, sliding vertically on one key can open the filter for that note alone.

The mistake people make

Enabling MPE on a synth that is not MPE-aware. Notes land on separate channels and the instrument only plays one of them.

WHERE MPE SITS

MPE belongs to midi, formats and standards in the Sampled music glossary. The plumbing — the specs your gear, files and delivery pipeline agree on.

TEST YOURSELF

0/3 answered · 0 correct

3 quick questions on mpe. Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes mpe?

  2. 2. What is the mistake people most often make with mpe?

  3. 3. In practice, which of these applies to mpe?

Ready for the full thing? Take the 25-question terminology test and get a certificate with your name and score.

SOURCES AND CITATIONS

Free, primary references for mpe — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • MIDI Association — MPE spec (opens in a new tab)

    Specification owner · The MIDI Association

    “MIDI Polyphonic Expression — each note gets its own channel so pitch bend, pressure and slide are per-note.”— the claim this source supports

    Why it counts: The body that publishes the MIDI specification, so this is the definition hardware and software are built against.

  • MIDI Association specifications (opens in a new tab)

    Specification owner · The MIDI Association

    “MIDI Polyphonic Expression assigns each note its own MIDI channel so pitch bend, pressure and slide apply per note rather than to the whole patch.”— the claim this source supports

    Why it counts: The body that publishes the MIDI specification, so this is the definition hardware and software are built against.

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