Additional Modes
187
Quantum Manual
•
State
: tap on the first state button to switch the cor-
responding MIDI In port on or off.
•
Layer 1/2 Input Channel
: tap on the corresponding
button to open a pop-up menu. Here you can select the
desired MIDI channel on which Layer 1 and Layer 2
reacts.
•
Local Keys
: determines whether incoming MIDI
messages are received (
On
) or ignored (
Off
) by the
keyboard.
•
MPE
options for MIDI DIN, USB Control and USB
Computer (see next section).
•
Apply Split to Inputs
: if set to
On
, it uses the keybed
split ranges for incoming external MIDI notes instead
of channels. Split points are interpreted from
untransposed keybed setting, i.e. the middle C3 is note
number 60.
About MPE
MIDI Polyphonic Expression (or MPE) is a method of using
MIDI to enable expressive electronic musical instruments
to control multiple dimensions of sound polyphonically. In
MIDI, channel-wide messages (such as pitch bend, CCs, and
channel aftertouch) are applied to all notes being played
on a single channel; therefore, in MPE each note is assig-
ned its own channel so that those messages can be applied
to each note individually.
An MPE instrument typically has three dimensions of
expression/control: left-right (X-axis); front-back (Y-axis);
and pressure (Z-axis) – each axis can be mapped to various
parameters of sound and be applied on a per-note basis.
Each MPE dimension is mapped to the Iridium Keyboard
sound engine as follows:
•
Left-right / X-axis (sent as MIDI Pitch Bend) – This
controls the pitch of the note, with the range set using
the PB Range for the corresponding oscillator.
•
Front-back / Y-axis (sent as MIDI CC 74) – This con-
trols the destination parameter set for the modulation
source MPE Y Axis.
•
Pressure / Z-axis (sent as MIDI Channel Aftertouch) –
this controls the Aftertouch modulation assignments.
From now on, MPE support is available for MIDI DIN, USB
Host (Controller) and USB Device (Computer). You can
activate MPE support individually. Further, if a connected
MPE Controller sends MCM (MPE Configuration Messages),
these will be detected and will automatically put Quantum
into MPE mode.
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