About. Monome. Create Digital Music. Audio and production tutorials, from beginner to advanced. { sound + design } The Theory and Technique of Electronic Music. PURE DATA forum~ Pure Data. PURE DATA: 05 MIDI (Mac) & Makenote. Note names, MIDI numbers and frequencies.
Note names, MIDI numbers and frequencies are related here in tables and via an application that converts them.
The musical interval between two notes depends on the ratio of their frequencies. See Frequency and Pitch for more details and an introduction to frequency and pitch. An octave is a ratio of 2:1 and, in equal temperament, an octave comprises 12 equal semitones.