This is an experiment used as a POC wich use webmidi to control the Novation Launchpad MKII.
Play with the DEMO
Or
git clone https://github.com/maxdow/launchpad-canvas-experiment
cd launchpad-canvas-experiment
npm install
npm start
Then open localhost:3000 and connect your launchpad . You can draw on it as a 8x8 canvas .