Behringer UB-Xa - MPE (MIDI Polyphonic Expression)

30 UB-Xa User Manual
MSB LSB 14-bit Parameter Name Range Scope Notes
16 4 2052 AmplierEnvLinearity 0~63 global
16 5 2053 AmplierEnvChaos 0~31 global
17 0 2176 PanningVoice1 0~255 global
17 1 2177 PanningVoice2 0~255 global
17 2 2178 PanningVoice3 0~255 global
17 3 2179 PanningVoice4 0~255 global
17 4 2180 PanningVoice5 0~255 global
17 5 2181 PanningVoice6 0~255 global
17 6 2182 PanningVoice7 0~255 global
17 7 2183 PanningVoice8 0~255 global
17 8 2184 PanningVoice9 0~255 global
17 9 2185 PanningVoice10 0~255 global
17 10 2186 PanningVoice11 0~255 global
17 11 2187 PanningVoice12 0~255 global
17 12 2188 PanningVoice13 0~255 global
17 13 2189 PanningVoice14 0~255 global
17 14 2190 PanningVoice15 0~255 global
17 15 2191 PanningVoice16 0~255 global
18 0 2304 AtrophyProleNameA 32~255 global
18 1 2305 AtrophyProleNameB 32~255 global
18 2 2306 AtrophyProleNameC 32~255 global
18 3 2307 AtrophyProleNameD 32~255 global
18 4 2308 AtrophyProleNameE 32~255 global
18 5 2309 AtrophyProleNameF 32~255 global
19 0 2432 SequencerStepCount 0~128 patch
19 1 2433 SequencerTime 0~6 patch Enumeration: 1/4 notes (0), 1/8 notes (1), 1/16 notes (2), 1/32 notes (3), 1/4
triplets (4), 1/8 triplets (5), 1/16 triplets (6),
19 2 2434 SequencerGatetime 0~99 patch
19 3 2435 SequencerSync 0~1 patch Enumeration: Global (0), Retrigger (1),
MPE
MIDI Polyphonic Expression (also known as Multidimensional Polyphonic Expression) is a MIDI extension adopted by the MIDI Manufacturers Association in 2018. It
allows much greater control of selected parameters than that available in the original MIDI spec by allocating a new MIDI channel to each note played (up to a limit of
15 notes) and therefore allowing each note to have parameters adjusted without aecting the other notes being played. A base channel is reserved for common MIDI
messages.
The UB-Xa has two ways of using MPE. The Single option uses channel 1 as the base channel, then uses the other fteen for MPE. However if a Split or Double Program
is in use it is possible to switch to the Zones mode, where two base channels, channel 1 for the lower keyboard and channel 16 for the upper, with channels 2 – 8 used
for lower keyboard MPE and channels 9 – 15 for the upper keyboard. The selection is option 14 in the MIDI/USB Menu (Shift & 65), where MPE can also be disabled,
which is the default option, as activating MPE deselects the MIDI Rx channels selected in options 1 and 2 of the same menu.
Typically MPE controllers output three parameters: Pitchbend, Timbre (Filter Cuto – MIDI CC #74) and Channel Pressure. The UB-Xa responds only to Pitchbend and
Timbre as standard; but all three controllers can be used as sources in the Modulation Matrices and can therefore be applied to any allowable destination. Note on and
o are also allocated to MPE channels in order that the notes are individually aected. If more than fteen (or seven plus seven) notes are played then two or more
notes will be allocated to one channel dynamically as necessary.
Pitchbend sensitivity for the upper and lower keyboards can be individually set by options 12 and 13 of the MIDI/USB Menu.