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Adding or subtracting 12 changes the note by one octave. 60 represents middle C.Adding or subtracting 1 is equivalent to moving one semitone higher or lower, respectively. A note can be selected by either typing in a number or pressing a key on the virtual keyboard. Therefore, as an easy reference, I am posting here the codes as used in Logic Studio 9. Play Note for Beats uses the MIDI note system. It becomes a problem when you work in a complex project where sounds have not been defined for all 10 octaves and you hit a note and hear nothingā¦ Yep, this is what happened to me. This is usually not a problem as all most MIDI devices can usually be transposed up or down easily.
![midi note number c1 midi note number c1](http://1.bp.blogspot.com/-j3Lxs0PsuBc/UWINIqJ8O0I/AAAAAAAAACA/FytzPJEzlhg/w1200-h630-p-k-no-nu/elsita.jpg)
![midi note number c1 midi note number c1](http://4.bp.blogspot.com/-coLGSNhAZ6I/Uf0-DP7GQsI/AAAAAAAAAC8/8_NPItnyOrU/s320/leluds1.jpg)
This means that MIDI note number 0 is C-2 and that the highest note possible is G8 (using MIDI note number 127). In the case of Logic Studio, middle C is C3. It turns out that various manufacturers place this middle C at different octaves. However, the specifications does not say which one is middle C. Therefore, MIDI note number 69, used for 440Hz tuning, should be the A above middle C (supposing an equal temperament tuning). All other notes are relative to this one. The MIDI specification, maintained by the MIDI Manufacturers Association, tells us that middle C is MIDI note number 60. However, knowing which note is which is not always straightforward. Another version of the MIDI system uses the lowest note available to the MIDI system (MIDI note 1, 8.176 Hz) to designate Octave '0' with the notation of C0. That means that the octave designation for MIDI note '0' would be '-2' or notated as C-2. This means there are 128 notes (2 7) that can be assigned in MIDI. One version of the MIDI system uses C3 to designate Middle C (MIDI note 60, 261.626 Hz). The MIDI numbering scheme uses 7 bits to identify all the notes.
![midi note number c1 midi note number c1](http://kurs.schacherl.info/Lernprogramme/MidiJsInstrument/Tastatur3.png)
MIDIĀ note numbers are the unique numbers assigned to each note in the MIDI system.
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