noc-webmidi

Novation Circuit™ noc-webmidi.js

This JavaScript library provides a way to interpret MIDI CC data from the Novation Circuit™ and it contains all the info needed to create a MIDI CC editor for the Circuit™ -- The MIDI CC info contained here comes from the official Novation™ "Circuit MIDI Parameters" guide, available here.

News

This project is now called 'noc-webmidi' (Novation Circuit™ Web MIDI. It's easier to remember, and it's more npm-friendly. Which leads to our next announcement -- noc-webmidi is now avialable on npm!

We're looking into adding SysEx and NPRN support, depending on what the WebMIDI spec supports.

Installation

1. For standard use in web pages: a. Use the "Clone or Download" button from the Github repo to obtain a local copy of the library. b. Add the '/dist/js/noc-webmidi.min.js' script to your html page:

<script src="/dist/js/noc-webmidi.min.js" type="text/javascript"></script>

1. For use with Node.js a. npm install --save noc-webmidi b. in your app add: var circuitMidiApp = require('noc-webmidi');

What is it?

The library contains a global JavaScript object named circuitMidiApp that includes the following:

• circuitMidiApp.midiChannels
  This Object's keys/values correspond to the Circuit's™ MIDI channels and the matching MIDI components:
  ** In WebMidi, midi channels are zero-indexed (midi channel 1 = WebMidi channel 0)

  { 0: "synth 1", 1: "synth 2", 9: "drum", 15: "session" }

• circuitMidiApp.midiCCs

  This Object contains all of the Circuit's™ MIDI CC data, broken down by component type:

  (Synth, Drum, Session) > CC number > CC attributes.

  Printing the object shows that each key is a Circuit™ midi component type:
  { drum: Object, session: Object, synth: Object }

  Inside a midi component type, the object keys are MIDI CC numbers:
  synth: { 3: Object, 5: Object, 9: Object, 13: Object, ... etc. (too many to list, but you get the idea) }

  The MIDI CC objects contain MIDI CC attributes:
  3: { default: 2, name: "Polyphony Mode", range: [0,2], rangeValues: ["Mono","Mono AG","Poly"] }

• circuitMidiApp.midiComponents This is a JavaScript Map of all the Circuit™ MIDI CC info:
  [ 0: {"synth 1": Map}, 1: {"synth 2": Map}, 2: {"drum 1": Map}, 3: {"drum 2": Map}, 4: {"drum 3": Map}, 5: {"drum 4": Map}, 6: {"session": Map} ]

  key: "synth 1", value: [ 0: "voice", 1: "osc 1", 2: "osc 2", 3: "mixer", 4: "filter", 5: "envelope", 6: "effects", 7: "macro" ]

  key: "voice", value: [ 0: { cc: 3, name: "Polyphony Mode", range: ["Mono","Mono AG","Poly"] }]

• circuitMidiApp.getCircuitMidiCC()
  This is a helper function that takes 2 parameters - MIDI channel number and MIDI CC number - and it returns the MIDI CC value object associated with those parameters.

  For example:
  circuitMidiApp.getCircuitMidiCC(1,108);
  The above function call sends parameters 1 (midi channels are zero-indexed, so 1 corresponds to midi channel 2) and 108 (midi cc number). The return value is the MIDI CC object for 'synth env 1 velocity':

  { default: 64, name: "env 1 velocity", range: [0,127], rangeValues:[-64,63] }

Sample code

If you're still not sure what's this is useful for, there's a sample project in the /sample_code folder. The file sample_code.js contains code for a simple Circuit MIDI CC editor. Open the file '/samples_code/index.html' in the Google Chrome web browser.

• Requirements to run the sample code:
  • A Novation Circuit™ + USB cable.
  • A computer running the Google Chrome browser, connected to the Novation Circuit™ via usb cable.

How to Contribute

If you find an error or see a way to improve, I recommend opening an issue to let me know. Some things may be easy fixes/improvements.

If you want to work on the code:

• Fork the repo to your own Github account.
• Clone your forked repo to your local computer.
• Find you local copy in Terminal (these steps require Node.js):
  • Run 'npm install'.
  • Run 'gulp watch'.
• Development files are in '/src/js'.
• Changes are compiled by Gulp into '/dist/js' and '/lib'.
• All code is written in vanilla JavaScript.

***I am not employed by or in anyway associated with Focusrite Novation™