Jeffrey Soong  You really don't need the instance methods in that example, It can be done at the class level. If I were to go back and redo this episode, I would leave any class level qualifying methods out of instance level methods. 

One thought, let's say you have a very complicated application (think ERP) and you have an onboarding wizard. This can take some companies a long time to complete and things need to happen in a certain order. As some stages are completed, a lot of background API calls are made and data is synchronized. Using State Machines may be a viable solution in these kinds of scenarios.

  [email protected] There shouldn't be anything to modify per say, but depending on what you're building, you may want to wrap it in a gem.

https://guides.rubygems.org/gems-with-extensions/

Gems with Extensions - RubyGems Guides

Tutorials, guides, FAQs for RubyGems package management

https://guides.rubygems.org/gems-with-extensions/

  almokhtarbekkour I would say that it’s possible. SoundWave gives enough flexibility with its APIs but is somewhat limited on the customization. For a true customization, Howler is pretty powerful. However, you would basically be building your own custom UI for it.

https://howlerjs.com/

howler.js - JavaScript audio library for the modern web

howler.js makes working with audio in JavaScript easy and reliable across all platforms.

https://howlerjs.com/

I did run into an issue recently where the quality selector no longer worked. I ended up having to do this.

import contribQualityLevels from 'videojs-contrib-quality-levels'

videojs.registerPlugin('qualityLevels', contribQualityLevels)