Roland SK-50 Owner's Manual page 18

NRPN LSB, MSB (Control Change No. 98/99)
Data Entry (Control Change No. 6/38)
An NRPN (Non-Registered Parameter Number) is a special, extended form of Control Change
message which allows settings to be made for certain unique functions that a device may have.
The parameter over which control is desired is specified first in terms of its NRPN MSB and
NRPN LSB. Then the Data Entry message is used to supply the value for the selected parameter.
<TX> Used to convey the value of the cut-off frequency when that function (
p. 25) has been assigned to a pedal. (The pedal action controls the value.)
<RX> This instrument supports the NRPNs that the GS Format defines as being universal for all
GS-compatible sound generating units. Applications or external controllers which support the
GS Format can therefore be used to make a complete range of precise settings for this
instrument's internal sound generator. For details on the parameters which can be controlled,
refer to the MIDI Implementation p. 41.
* Any values which have been specified using NRPNs will still remain in effect even after a
Tone change has been made (as the result of receiving a Program Change message, for
example).
* In order to comply with the MIDI Specifications, sound generating units need to be set (at
their default power-on state) to ignore all NRPNs. The reason for this is to avoid some of the
incompatibilities that could arise through the use of NRPNs. Therefore, this instrument will be
capable of recognizing NRPNs only after it has received a GS Reset (or has had "Rx. NRPN"
turned ON directly by means of the appropriate Exclusive message, defined in the GS
Format).
RPN LSB, MSB (Control Change No. 100/101)
Data Entry (Control Change No. 6/38)
An RPN (Registered Parameter Number) is an extended form of Control Change message which
allows settings to be made for certain functions defined by the MIDI Specifications.
The parameter over which control is desired is specified first in terms of its RPN MSB and RPN
LSB. Then the Data Entry message is used to supply the value for the specified parameter.
<RX> This instrument will alter the settings for its internal sound generator to comply with any
Pitch Bend Sensitivity, Master Course Tune, or Master Fine Tune messages that it receives.
* Any values which have been specified using RPNs will still remain in effect even after a Tone
change has been made (as the result of receiving a Program Change message, for example).
SOLO Volume,
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