machinaeXphilip/midi-parser-dynamic-octaves

a simple parser that takes a given note string (e.g. 'C#-2') and returns its midi number (e.g. 1) depending on the lowest octave defined.

MIDI parser with dynamic octaves

a simple parser, to convert note names (e.g. 'C-2') into the corresponding MIDI number (0-127).

By default it considers the lowest possible octave for the midi range to be -2. So the midi number 0 corresponds to 'C-2'.

This is to match the behaviour of audio tools and instruments that use this octave designation as described for example in this forum post

But you can easily adapt this behaviour when instanciating the parser:

Usage / example

const {midiparser} = require('./index.js');

parserOne = new midiparser();  // defaults to -2 as the lowest octave 
parserTwo = new midiparser(0); // lowest octave here is 0

console.log(parserOne.getMidiNumber(0)); // ==> 0
console.log(parserTwo.getMidiNumber(0)); // ==> 0

console.log(parserOne.getMidiNumber('C-2')); // ==> 0
console.log(parserTwo.getMidiNumber('C-2')); // ==> undefined

console.log(parserOne.getMidiNumber('C')); // ==> 24
console.log(parserTwo.getMidiNumber('C')); // ==> 0