MPE Tester

Test your MIDI Polyphonic Expression (MPE) configuration.

MPE Summary

• Wherever possible, every sounding note is assigned its own MIDI Channel for the lifetime of that note.
• By default, Pitch Bend is set to of ±48 semitones for per-note bend and ±2 semitones for Master bend. Either range may be changed to a number of semitones between 0 and ±96 using RPN 0.
• Aftertouch is sent using the Channel Pressure message. To preserve compatibility with existing MIDI devices, Polyphonic Key Pressure may be used with notes on the Master Channel, but not on other Channels.
• A third dimension of per-note control may be expressed using MIDI CC #74.
• A Registered Parameter Number is used to set the range of Channels over which notes are sent and received. The MIDI Channel space can be divided into sub-spaces called Zones, so that multi-timbral playing is still possible using only one MIDI cable.
  • Each Zone has a dedicated extra Channel, called the Master Channel, which conveys information common to all notes in that Zone, including pedal data and overall Pitch Bend.
  • There are usually two zones. The Lower Zone is controlled by Master Channel 1, with Member Channels assigned sequentially from Channel 2 upwards. The Upper Zone is controlled by Master Channel 16, with Member Channels assigned sequentially from Channel 15 downwards.

Resources

• Official specifications
• https://www.midi.org/articles-old/midi-polyphonic-expression-mpe
• http://www.rogerlinndesign.com/mpe.html
• https://roli.com/mpe