I just tested a few things with the HD button. Here’s what I found:
When you have only two sources, the player loads with the HD button turned off and loads the first source listed. Using “default”:“true” seems to have no impact for me. Please note that we also leave a cookie on the page that remembers your quality selection. If you load the page and the HD button is off and then you click it, the HD button will be on when you refresh the page because the cookie remembers you chose the higher quality source.
When you have three or more sources listed, our player will list them in the same order you did in your setup. You can essentially choose the order. You can also add “default”:“true” to the source that you wish to be the default. Please note that the cookie will override your default selection.