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Orba User Manual
MPE (MIDI Polyphonic Expression)
MPE (MIDI Polyphonic Expression) is a method that allows players to control multiple
parameters (pitch bend, aftertouch, and vibrato) independently per note. On a traditional
MIDI keyboard, for example, the Pitch Bend wheel affects all notes at once. An MPE com-
patible controller will allow these notes to be affected independently from one another.
All notes are sent as MPE MIDI with every note having its own channel so that per-note
controllers can be used. In this mode, only the MIDI notes for the currently active mode
are sent out on MIDI. For example, when Bass mode is selected only the MIDI out for Bass
is sent.
Single Mode
All notes are sent on MIDI channel 1. Only the MIDI notes for the currently active mode
are sent. For example when drum mode is selected only the drum notes are sent out on
MIDI.
Channel-Per-Part
Each instrument mode sends MIDI data out on a dedicated channel. Switching modes will
switch the output channel accordingly.
Channel 10 Drum
Channel 9 Bass
Channel 16 Chord
Channel 1 Lead
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