Fluid Music Utilities

This installs several CLI helper tools for creating fluid-music recipes.

Use npm install -g @fluid-music/utils to install:

• afactory
• transcribe-chords

afactory

Recursively searches a directory for audio files, and generates a fluid-music AudioFile technique for each audio file it finds. The output techniques will be written to a common.js formatted JavaScript file which exports a deeply nested JavaScript object reflecting the input directory structure.

Usage:

$ afactory ./search/dir [outfile='audio-files.js']

Example:

Assume your working directory contains the following files:

./drums/snare.wav
./drums/hi-hat/close.wav
./drums/hi-hat/open.wav

Step 1: Run afactory from the working directory:

$ afactory ./ audio.js

Step 2: afactory will create an audio.js file, which looks like this:

const { AudioFile } = require('fluid-music').techniques
module.exports = {
  "drums": {
    "snare.wav":   new AudioFile({ /* init options */ }),
    "hi-hat": {
      "close.wav": new AudioFile({ /* init options */ }),
      "open.wav":  new AudioFile({ /* init options */ }),
    },
  },
};

Step 3: You can now require('./audio.js'), to access the exported objects, using them to manually create fluid-music tLibrary objects.

transcribe-chords

A super quick way to transcribe midi chords in JSON using a midi keyboard.

$ npm install -g @fluid-music/utils
$ transcribe-chords chords.js
Usage: $ transcribe-chords out.js # (Currently writing to "chords.js")
connected: "Midi Through Port-0"
connected: "MPK Mini Mk II MIDI 1"

Now play some chords on any connected midi device to generate a file like the one below (use ctrl+c to stop recording).

const fluid = require('fluid-music')
const { MidiChord } = fluid.techniques

const chords = [
  new MidiChord({
    name: 'Gm',
    notes: [55, 58, 62],
  }),

  new MidiChord({
    name: 'Bbsus4',
    notes: [58, 60, 63, 65],
  }),

  new MidiChord({
    name: 'Cm',
    notes: [60, 63, 67],
  }),
]

module.exports = chords

You can create a tLibrary like this:

const fluid = require('fluid-music')
const chords = require('./midi-chords')

const tLibrary = fluid.tLibrary.fromArray(techniques)

// tLibrary will look like this:
{
  a: MidiChord({ name: 'Gm',     notes: [55, 58, 62] }),
  b: MidiChord({ name: 'Bbsus4', notes: [58, 60, 63, 65] })
  c: MidiChord({ name: 'Cm',     notes: [60, 63, 67] }),
}