Wordpress Plugin / EDD Extension js-PHP

I want to build an Easy Digital Downloads Extension (a Wordpress plugin) for the actual extension Audio Player that uses jPlayer. Basically is an extension to the extension. The developer must have experience in developing Wordpress plugins (PHP) and Javascript for customizing the jPlayer. Any work examples are welcome. The platform distributes the EDD-Extension-Boilerplate available for developers online that you can use. What the extension/plugin must do: 1. Is based on the actual Audio Player Extension (that means that a user must have installed the audio plugin in order to make it work). We will provide the extension, you don't need to buy it. 2. When activated brings the "Play" button into the grid / list over the thumbnail image with the following settings: a. full thumbnail b. half thumbnail c. quarter thumbnail 3. Inside the Detail Page the player must have a custom skin with waveform generator using [login to view URL] that is available online for free, must have auto-play. 4. The plugin must be compatible with the actual version of Wordpress and Easy Digital Downloads Audio Player Extension 5. We will provide all the graphic design for the players (images or CSS code). 6. Must be in HTML5 no Flash. We must have the exclusive right to sell it without any royalties. We will get back to you for updates on the same plugin in the future. See what we need exactly in the screenshots. If you have doubts, please ask.