Appendix G: Additional RPN Messages

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Keystation Mini 32 User Guide

Appendix G: Additional RPN Messages

You may have noticed that although we have stated there are 128 MIDI controller messages (0 – 127), Appendix D, “Standard 
MIDI CC Number” shows 132 assignable controller messages. This is because messages 128 – 131 are a different type of MIDI mes-
sage, defined in the MIDI Specification as RPN messages. M-Audio has created four messages that are sent like MIDI CCs, but ac-
tually transmit a series of RPN messages. This makes sending these complex multi-part messages as easy as sending a MIDI CC 
message. The RPN messages control the following:

Parameter

Message

Use

128

Pitch Bend Sensitivity

Alters the range of a pitch bend message

129

Fine Tune

Adjusts the tuning of your sound module or synthesizer in small steps

130

Coarse Tune

Adjusts the tuning of your sound module or synthesizer in large steps

131

Channel Pressure

Adds an effect such as vibrato or brightness, depending on the instru-
ment settings and capabilities

Channel Pressure is not an RPN message. However, it is an additional effect message defined in the General MIDI specification 
and this is why we have included it in Appendix E, “MIDI Message Definitions.”