I've been confused by this, where some software or MIDI files expect "middle C" to be C3, and others C4. For example, another article states:
> There are TWO conventions for numbering keys (notes) in MIDI. The most common is the one below where MIDDLE C (note #60; $3C) is C3 (C in the 3rd octave).
> However, another convention was adopted by Yamaha Corp. for their synthesizer products which parallels the Octave Designation System used in Music Education formulated by the Acoustical Society of America. In that convention, Middle C is designated "C4".
> The "C3 Convention" is the most commonly used octave designation system on standard MIDI keyboards and this is the convention we will use for this class.
From: Computer Music (MUSC 216) MIDI Note/Key Number Chart
I've been confused by this, where some software or MIDI files expect "middle C" to be C3, and others C4. For example, another article states:
> There are TWO conventions for numbering keys (notes) in MIDI. The most common is the one below where MIDDLE C (note #60; $3C) is C3 (C in the 3rd octave).
> However, another convention was adopted by Yamaha Corp. for their synthesizer products which parallels the Octave Designation System used in Music Education formulated by the Acoustical Society of America. In that convention, Middle C is designated "C4".
> The "C3 Convention" is the most commonly used octave designation system on standard MIDI keyboards and this is the convention we will use for this class.
From: Computer Music (MUSC 216) MIDI Note/Key Number Chart
https://computermusicresource.com/midikeys.html