Yamaha QY100 Owner's Manual page 226

Editing Songs & Patterns
RPN
Inserts RPN data. RPN is an abbreviation for "Registered
Parameter Number", which is a MIDI message used to
control part settings such as pitch bend sensitivity, tuning,
etc. Refer to the "MIDI Data Format" section of the Data
List for details.
RPN LSB Data entry LSB
Location RPN MSB Data entry MSB
NRPN
Inserts NRPN data. NRPN is an abbreviation for "Non Reg-
istered Parameter Number", which is a MIDI message
used to control voice settings such as vibrato, filter, enve-
lope generator, drum setup, etc. Refer to the "MIDI Data
Format" section of the Data List for details.
NRPN LSB
Location NRPN MSB Data entry MSB
226