FYI, from a Cakewalk forum :

"Basically, in MIDI (by the MIDI standard), middle C is assigned to note 60. Working down to the lowest octave that can be represented as octave 0, middle C is in the 5th octave, hence, C5.

It's not that unusual of a convention. Most (not all) MIDI notation stuff refers to middle C as C5. On a piano, it's typically C4 (the 4th C on a piano), but MIDI can go lower."


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