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7
NRPN
NRPN stands for "Non-Registered Parameter Number" and is part of the MIDI specication
for control of electronic musical instruments. NRPNs allow for manufacturer-specic or
instrument-specic MIDI controllers that are not part of the basic MIDI standard.
Unlike other MIDI controllers (such as velocity, modulation, volume, etc), NRPNs require
more than one piece of controller data to be sent. First, controller 99 - NRPN Most
Signicant Bit (MSB) - followed by 98 - NRPN Least Signicant Bit (LSB) sent as a pair
specify the parameter to be changed. Controller 6 then sets the value of the parameter in
question. Controller 38
may optionally then be sent as a ne adjustment to the value set by controller 6.
This ne adjustment is part of the conventional MIDI controller specication, where any
of the rst 32 controls can be optionally paired with a control offset 32 higher. This is the
rare 14-bit Continuous Controller feature of the MIDI specication, and NRPNs simply take
advantage of that existing option in the same way to offer 16,384 possible values instead of
only 128.
NRPNs allow for MIDI control of a vastly greater number of parameters than the basic 121
set out in the basic MIDI standard.
KEYBOARD CURVE
To change the velocity response curve of all the keys on the keyboard use the following
sequence.. Press the EDIT button, then KEYBOARD CURVE, then a NUMBER value between
1 and 5 (1 being the softest velocity curve and 5 being the hardest), then ENTER.
PEDAL CURVE
You can adjust the PEDAL CURVE to work better with pedals of different specications and
resistance values. If the pedal's range is short, you should turn the PEDAL CURVE up. If the
pedal cannot reach the max or the min, you should turn the PEDAL CURVE down.
You can estimate the pedal curve value by the expressions: PEDAL CURVE = (128* pedal
resistance value) / (10K+pedal resistance value). For instance, if the pedal resistance value
is 10K, then the PEDAL CURVE = 128* 10K/ (10K+10K) = 64. As explained in Section 4.2, any
controller can be used to adjust it if previously assigned to the preset. Adjust it by refering
to ASSIGNING THE KEYBOARD & USING THE IN-BUILT FUNCTIONS (page 5).
