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Non-Registered Parameter Number -LRB- NRPN -RRB- is part of the Musical Instrument Digital Interface -LRB- MIDI -RRB- specification for control of electronic musical instruments .. MIDI. MIDI. NRPNs allow manufacturer-specific or instrument-specific MIDI controllers that are not part of the basic MIDI standard .. MIDI. MIDI. Unlike other MIDI controllers -LRB- such as velocity , modulation , volume , etc. -RRB- , NRPNs require more than one item of controller data to be sent .. MIDI. MIDI. velocity. velocity. modulation. modulation. volume. volume. First , controller 99 - NRPN Most Significant Byte -LRB- MSB -RRB- - followed by 98 - NRPN Least Significant Byte -LRB- LSB -RRB- sent as a pair specify the parameter to be changed .. Controller 6 then sets the value of the relevant parameter .. Controller 38 may optionally then be sent as a fine adjustment to the value set by controller 6 .. This fine adjustment is part of the conventional MIDI controller specification , where any of the first 32 controls can be optionally paired with a control offset 32 higher .. MIDI. MIDI. This is the rare 14-bit Continuous Controller feature of the MIDI specification , and NRPNs simply take advantage of that existing option in the same way to offer 16,384 possible values instead of only 128 .. MIDI. MIDI. NRPNs allow MIDI control of a vastly greater number of parameters than the basic 121 found in the basic MIDI standard .. MIDI. MIDI